Podcasts about observable universe

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Best podcasts about observable universe

Latest podcast episodes about observable universe

StarTalk Radio
Cosmic Queries – Before the Big Bang

StarTalk Radio

Play Episode Listen Later Mar 11, 2025 42:42


What does it really mean for us to be made of stardust? Neil deGrasse Tyson and co-host Paul Mecurio answer fan questions about particle colliders, time travel, and what existed before the Big Bang. NOTE: StarTalk+ Patrons can listen to this entire episode commercial-free here: https://startalkmedia.com/show/cosmic-queries-before-the-big-bang/Thanks to our Patrons John 73, BrianSmiley, Brian Johnson, TIm, Klaus Wagner, Cynthia A Stevens, Valentijn van tongeren, Jmcarman23, J Gonzales, Kaden Brown, Sam Spencer, BSM1989, Caleb, Cristian Gonzalez, Stephen Davis, Stefan Jones, Walt Krutzfeldt, Hazel, Lukáš Mašek, Andrew, Craig Haagenson, Jessi, Taj Orndorff, Jacob Hernandez, Keith Thienpondt, Dusty Salyer-Elliott, Ignacio Karacsonyi, Bradley Foster, Melissa Forlini, Seth Lotstein, Hamid Pourkasraei, Linda, Ali Mojabi, and Mahmoud Hassan for supporting us this week. Subscribe to SiriusXM Podcasts+ to listen to new episodes of StarTalk Radio ad-free and a whole week early.Start a free trial now on Apple Podcasts or by visiting siriusxm.com/podcastsplus.

Universe Today Podcast
[Overtime Q&A] Conspiracy Theories in School, Preserving History, JWST Restrictions

Universe Today Podcast

Play Episode Listen Later Nov 20, 2024


Should they teach conspiracy theories in schools? How can we preserve history? How restricted is JWST because of its sunshield? Answering all these questions and more in this week's Overtime Q&A.

Universe Today Podcast
[Overtime Q&A] Conspiracy Theories in School, Preserving History, JWST Restrictions

Universe Today Podcast

Play Episode Listen Later Nov 20, 2024 24:27


Should they teach conspiracy theories in schools? How can we preserve history? How restricted is JWST because of its sunshield? Answering all these questions and more in this week's Overtime Q&A.

Connor Pugs
the cringiest kid in the OBSERVABLE UNIVERSE (storytime - FULL MOVIE)

Connor Pugs

Play Episode Listen Later Sep 20, 2024 237:57


the cringiest kid in the OBSERVABLE UNIVERSE (storytime - FULL MOVIE) --- Support this podcast: https://podcasters.spotify.com/pod/show/connor-pugs/support

movies storytime full movie observable universe
Writer's Bone
Episode 673: Not Flirting With Darkness With Heather McCalden

Writer's Bone

Play Episode Listen Later Aug 27, 2024 37:52


Author and artist Heather McCalden joins Daniel Ford on the show to discuss her memoir The Observable Universe.  To learn more about Heather McCalden, visit her official website. Writer's Bone is proudly sponsored by Chelsea Devantez and her upcoming book I Shouldn't Be Telling You This: (But I'm Going to Anyway), Libro.fm, and Everyday Shakespeare.

Connor Pugs
the cringiest kid in the observable universe.. (full movie!)

Connor Pugs

Play Episode Listen Later Jun 26, 2024 219:53


Connor Pugs tells a Storytime about the cringiest kid in the observable universe.. (full movie!) this is a great story to fall asleep to and a great video to fall asleep to as this is a compilation of the best stories podcast on spotify and the best minecraft storytimes and roblox storytimes. Try not to laugh and try not to cringe at these funny and cringey stories Listen to my stories on Spotify:

The Future of Everything presented by Stanford Engineering

Astrophysicist Risa Wechsler studies the evolution of the universe. She says that our understanding of how the universe formed and how it will change over time is changing as new technologies for seeing and measuring space come online, like a new high-resolution camera that can quickly map the full sky to see everything that moves, or new spectrographs that will map the cosmos in 3D and enable us to get new clues about the elusive dark matter. You can't understand the universe or our presence in it until you understand dark matter, Wechsler tells host Russ Altman on this episode of Stanford Engineering's The Future of Everything podcast.Episode Reference Links:Risa Wechsler: WebsiteStanford Profile: WebsiteSLAC National Accelerator LaboratoryLegacy Survey of Space and Time (LSST) | Rubin ObservatoryDark Energy Spectroscopic Instrument (DESI)The SAGA SurveyConnect With Us:Episode Transcripts >>> The Future of Everything WebsiteConnect with Russ >>> Threads or Twitter/XConnect with School of Engineering >>> Twitter/XChapters:(00:00:00) IntroductionRuss Altman introduces guest Professor Risa Wechsler, professor of physics, particle physics, and astrophysics from Stanford University.(00:01:46) Tools for Studying the UniverseTechnologies and methods used to study galaxies and the universe, including the Rubin Observatory's Legacy Survey of Space and Time.(00:04:37) Understanding Maps of the UniverseThe concept of mapping the universe in two and three dimensions, the significance of redshifts, and the application of spectroscopy.(00:08:56) The Structure and Scale of the UniverseThe age, expansion, and overall structure of the universe, touching on its isotropic nature and clumpiness on different scales.(00:12:23) Delving into Galaxy Formation and EvolutionAn in-depth look at galaxy formation, the role of dark matter, and how galaxies have evolved over billions of years.(00:14:49) The Diversity of Galaxies and Their StructuresThe various types of galaxies, including satellite and dwarf galaxies, and how they form and evolve differently.(00:18:56) Dark Matter and Dark EnergyThe fundamental aspects of dark matter and dark energy, their role in the universe, and the challenges in studying them.(00:22:32) Mapping the Universe with Modern ToolsHow current technologies and methods contribute to our understanding of the universe's expansion and structure(00:24:57) Applying Cosmic UnderstandingThe SAGA Survey and its implications for understanding the Milky Way in a broader cosmic context.(00:29:29) Conclusion Connect With Us:Episode Transcripts >>> The Future of Everything WebsiteConnect with Russ >>> Threads or Twitter/XConnect with School of Engineering >>> Twitter/X

Daily Shower Thoughts
You are the center of the observable universe | + 26 more...

Daily Shower Thoughts

Play Episode Listen Later Apr 29, 2024 5:34


The Daily Shower Thoughts podcast is produced by Klassic Studios. [Promo] Check out the Daily Dad Jokes podcast here: https://dailydadjokespodcast.com/ [Promo] The Daily Facts Podcast. Get smarter in less than 10 minutes a day. Pod links here Daily Facts website. [Promo] The Daily Life Pro Tips Podcast. Improve your life in less than 10 minutes a day. Pod links here Daily Life Pro Tips website. [Promo] Check out the Get Happy Headlines podcast by my friends, Stella and Mickey. It's a podcast dedicated to bringing you family friendly uplifting stories from around the world. Give it a listen, I know you will like it. Pod links here Get Happy Headlines website. Shower thoughts are sourced from reddit.com/r/showerthoughts Shower Thought credits: samof1994, inspire-change, Geoz195, Similar_Set_6582, Thieu95, Toomad316, SnazzyStooge, FalcorDD, painstarhappener, ImpossiblePudding696, Hodoss, we_made_yewww, Fresh_Distribution54, Acceptable-Gift-5319, pigbrotha, Vast-Intention, Imakeglassart, PistachioedVillain, InfinityScientist, , youareactuallygod, livingdeadfreak, IameIion, Zinyak1503, mr2freak, Retoucherny, _StygianBlueGames_, Expensive_Ad6082 Podcast links: Spotify: https://open.spotify.com/show/3ZNciemLzVXc60uwnTRx2e Apple Podcasts: https://podcasts.apple.com/us/podcast/daily-shower-thoughts/id1634359309 Stitcher: https://www.stitcher.com/podcast/daily-dad-jokes/daily-shower-thoughts iHeart: https://iheart.com/podcast/99340139/ Amazon Music: https://music.amazon.com/podcasts/a5a434e9-da18-46a7-a434-0437ec49e1d2/daily-shower-thoughts Website: https://cms.megaphone.fm/channel/dailyshowerthoughts Social media links Facebook: https://www.facebook.com/DailyShowerThoughtsPodcast/ Twitter: https://twitter.com/DailyShowerPod Instagram: https://www.instagram.com/DailyShowerThoughtsPodcast/ TikTok: https://www.tiktok.com/@dailyshowerthoughtspod Learn more about your ad choices. Visit megaphone.fm/adchoices

spotify social stitcher shower amazon music iheart shower thoughts observable universe promo check klassic studios daily dad jokes
Standard Issue Podcast
SIM Ep 957 Pod 299: All aboard the flying bath mat!

Standard Issue Podcast

Play Episode Listen Later Apr 2, 2024 54:48


Experts - we should listen to them, right? RIGHT? Well, maybe not all of them. That's what Hannah learned while talking to Dr Julia Shaw, a criminal psychologist and the host of new Radio 4 show Experts on Trial. Jen's been on the Zoom with Heather McCalden to talk about her genre-bending debut book, The Observable Universe, which is about losing both her parents to AIDS in the early '90s, and grief in the internet age. And in Rated or Dated, having not seen it as kids, what will Mickey and Hannah make of 1984's The NeverEnding Story? Learn more about your ad choices. Visit megaphone.fm/adchoices

StarTalk Radio
Cosmic Queries – Out There

StarTalk Radio

Play Episode Listen Later Mar 15, 2024 50:09


Neil deGrasse Tyson, co-host Harrison Greenbaum, and astrophysicist Janna Levin answer questions on the far away and the far out, including Andromeda's impending collision with the Milky Way, white holes, a holographic universe, and more. Prepare to get trippy!NOTE:  StarTalk All-Access subscribers can watch or listen to this entire episode commercial-free here: https://startalkmedia.com/show/cosmic-queries-out-there/(Originally released February 15, 2019)

Connor Pugs
the cringiest kid in the observable universe..

Connor Pugs

Play Episode Listen Later Jan 11, 2024 233:51


Connor Pugs tells a Storytime about the cringiest kid in the observable universe..

storytime cameo scrubs observable universe
StarTalk Radio
Our Burning Questions – Age of the Universe & More

StarTalk Radio

Play Episode Listen Later Dec 29, 2023 47:55 Very Popular


What is the greatest scientific breakthrough? Neil deGrasse Tyson answers co-hosts Chuck Nice and Gary O'Reilly's burning questions they have been saving all year about the age of the universe, the double slit experiment, and the nature of time. Is time even real? NOTE: StarTalk+ Patrons can listen to this entire episode commercial-free here: https://startalkmedia.com/show/our-burning-questions-age-of-the-universe-more/Thanks to our Patrons Jessi Strong Spear, Jeffrey Brenman, Dr. Cy (she, her, hers), Amanda Kerschen, Andrea Chitwood, Glenn Downing, and Lucas Reames for supporting us this week.Photo Credit: Timm Weitkamp, CC BY 3.0 DE, via Wikimedia Commons

Connor Pugs
The Cringiest Kid In The Observable Universe (STORYTIME)

Connor Pugs

Play Episode Listen Later Oct 2, 2023 237:57


Connor Pugs tells a Storytime of The Cringiest Kid In The Observable Universe --- Support this podcast: https://podcasters.spotify.com/pod/show/connor-pugs/support

storytime observable universe
Foundations of Amateur Radio
All the power in the observable universe expressed in milliwatts ...

Foundations of Amateur Radio

Play Episode Listen Later Sep 30, 2023 6:50


Foundations of Amateur Radio If you've been following my amateur radio journey, you'll have likely noticed that I've been straying from the fold. The words I use for power have been changing. I've reduced references to Watt and increased use of the term decibel. Initially this was incidental, recently it's been more of a deliberate decision and I'd like to explain how this came to be. It starts with representing really big and really small numbers. Let's start big. On 14 September, 2015 the first direct observation of gravitational waves was made when a pair of black holes with a combined estimated weight of 65 solar masses merged. The signal was named GW150914, combining "Gravitational Wave" and the observation date to immortalise the event. Following the collision, it was estimated that the radiated energy from the resulting gravitational waves was 50 times the combined power output of all the light from all the stars in the observable universe. As a number in Watts, that's 36 followed by 48 zeros. If you're curious, there's even a word for that, 36 Quindecillion Watts. Now let's look at small. The typical signal strength received from a GPS satellite, like say by your phone, is about 178 attowatts, or in Watts, 0.000 and so on, in all, 13 zeros between the decimal point and then 178. What if I told you that the energy associated with the collision of those two black holes could be expressed in comparison with a milliwatt. Remember, this collision emitted more energy than all the output of light from all the stars in the observable universe. The expression for all that power is 526 dBm. Similarly, the tiny received GPS signal can be expressed as -127.5 dBm. Just let that sink in. All the power in the observable universe through to the minuscule power received by the GPS in your phone, all expressed between 526 dBm and -127.5 dBm, and not a zero in sight. As I mentioned, the unit dBm relates to a milliwatt. As a starting point, let me tell you that 1 Watt is 1,000 milliwatts and is represented by 30 dBm. The decibel scale doesn't work quite the same as other number ranges you might be used to. Adding the value 3 doubles its size and adding the value 10 increases its size by a factor 10. For example, to double power from 1 Watt or 30 dBm, add 3 and get 33 dBm, which is the same as 2 Watts. If you want to increase 1 Watt by a factor 10, again, starting with 30 dBm, add 10 and get 40 dBm which is 10 Watts. Similarly, 50 dBm is 100 Watts and 60 dBm is 1,000 Watts. Going the other way, halving power, remove 3. So taking 3 from 60 dBm is 500 Watts or 57 dBm. Dividing power by a factor 10 works the same, take 10. So 47 dBm is 50 Watts and 37 dBm is 5 Watts. If you get lost, remember, dBm relates to a milliwatt. 1 Watt is 1,000 milliwatts and is represented by 30 dBm. Divide by a factor 1,000, remove 30 and end up with 0 dBm, which is the same as 1 milliwatt. I'll say that again, 0 dBm is the same as 1 milliwatt. It takes a little getting used to, but you can do some nifty things. For example, remove 10 to get a tenth of a milliwatt, or -10 dBm. This same process of adding and subtracting applies in other ways too. Attenuation, or making a signal weaker, and amplification, or making a signal stronger can use the same rules. For example, if you apply 3 dB of attenuation, you're making the signal 3 dB weaker, or halving it, so you subtract 3 dB from your power output. If your amplifier is rated at 6 dB gain, you're quadrupling the output and you add 6 dB to your power output. Similarly, if you talk about the gain of an antenna, you add it. If the gain is 20 dBi, you add it to the power output. You can use this for coax loss calculations as well. A 100m length of RG-58 at 28 MHz has a loss of 8 dB. You can directly subtract this from the power output of the transmitter and know precisely how much power is making it to the antenna. There's more. The radio amateur S9 signal strength on HF, something which we consider to be a strong signal, can be expressed as -73 dBm or a very small fraction of a milliwatt. An S8 signal is 6 dB weaker, or -79 dBm. A 20 over 9 report is -53 dBm. I will point out that this is at 50 Ohm. As a result, we now have a continuous scale for all the elements in the transmission chain between the transmitter and the receiver. While I'm here, I've already mentioned that negative dBm readings relate to fractions of a milliwatt, so values between 0 and 1. This highlights one limitation of this scale. We cannot represent 0 Watts. Mind you, that doesn't happen all that often. The thermal noise floor in space at 1 Hz bandwidth, that's at 4 kelvins, is -192.5 dBm, which practically means the minimum level of power we need to express. It's also a good value to remember because if you're doing funky calculations and you end up with a number less than -192.5 dBm, you can pretty much guarantee that you've probably made a boo-boo. 0 Watts using the dBm scale is represented by negative infinity, or essentially a division by zero error, really not defined, so there's that. I'm Onno VK6FLAB

The Daily Swole
#2482 - She Is The Observable Universe

The Daily Swole

Play Episode Listen Later Feb 21, 2023 70:56


At least she didn't show us Uranus. *NEW* OVERTIME segment now available for members. The new Driving While Gaining was AWESOME!! Submit A Question For The Show Join The SwoleFam APPAREL - Use code "DAILYSWOLE" for 10% off Download The 7 Pillars Ebook Watch The Daily Swole Try A Swolega Class From Inside Swolenormous X Get Your Free $10 In Bitcoin Questions? Email Us: Support@Swolenormous.com

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Matinee Heroes
Top Gun: Maverick

Matinee Heroes

Play Episode Listen Later Jan 21, 2023 75:55


TOP GUN: MAVERICK After more than 30 years of service as one of the Navy's top aviators, Pete "Maverick" Mitchell is where he belongs, pushing the envelope as a courageous test pilot and dodging the advancement in rank that would ground him. Training a detachment of graduates for a special assignment, Maverick must confront the ghosts of his past and his deepest fears, culminating in a mission that demands the ultimate sacrifice from those who choose to fly it. Craig, Alan and Guest Blake Casselman talk about legacy sequels, Tom Cruise, Blake's upcoming film “Limbo” and the movie “Top Gun: Maverick” on this week's Matinee Heroes. Show Notes 0:58 Craig, Alan and Blake Casselman talk about Blake's micro-budget feature "Limbo" coming out in February on Observable Universe. 8:31 Craig, Alan and Blake discuss "Top Gun: Maverick" 33:23  Recasting 1:00:53  Double Feature 1:09:09 Final Thoughts 1:13:01 A preview of next week's episode "The Fablemans" Next week we finish our best of 2022 with the master, Steven Spielberg's "The Fablemans"

Astro arXiv | all categories
Is the Observable Universe Consistent with the Cosmological Principle?

Astro arXiv | all categories

Play Episode Listen Later Oct 13, 2022 0:51


Is the Observable Universe Consistent with the Cosmological Principle? by Pavan Kumar Aluri et al. on Thursday 13 October The Cosmological Principle (CP) -- the notion that the Universe is spatially isotropic and homogeneous on large scales -- underlies a century of progress in cosmology. It is formulated through the Friedmann-Lema^itre-Robertson-Walker (FLRW) cosmologies as the spacetime metric, and culminates in the successful and highly predictive $Lambda$-Cold-Dark-Matter ($Lambda$CDM) model. Yet, tensions have emerged within the $Lambda$CDM model, most notably a statistically significant discrepancy in the value of the Hubble constant, $H_0$. Since the notion of cosmic expansion determined by a single parameter is intimately tied to the CP, implications of the $H_0$ tension may extend beyond $Lambda$CDM to the CP itself. This review surveys current observational hints for deviations from the expectations of the CP, highlighting synergies and disagreements that warrant further study. Setting aside the debate about individual large structures, potential deviations from the CP include variations of cosmological parameters on the sky, discrepancies in the cosmic dipoles, and mysterious alignments in quasar polarizations and galaxy spins. While it is possible that a host of observational systematics are impacting results, it is equally plausible that precision cosmology may have outgrown the FLRW paradigm, an extremely pragmatic but non-fundamental symmetry assumption. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2207.05765v3

StarDate Podcast
Observable Universe

StarDate Podcast

Play Episode Listen Later Aug 1, 2022 2:14


The universe might be infinitely large. And even if it's not, it's probably so big that it might as well be infinite. But we see only a tiny fraction of that extent — a bubble known as the observable universe. What we see is limited by the speed of light — 670 million miles per hour. That's fast. But it's not infinite. So light can travel only so far in a year, or a century, or a billion years. Because the universe was born 13.8 billion years ago, we can't see any farther than light can travel in that time — 13.8 billion light-years. The farthest galaxies and quasars that we've seen are almost that far away. Or they were that far away. We see these objects as they looked at a distance of more than 13 billion light-years. But keep in mind that the universe is expanding. So today, there's a lot more space between us and those early objects. In fact, today the edge of the observable universe is about 46 billion light-years away. Assuming Earth were still around, in tens of billions of years, we'd see what those objects look like today. And the limits of the observable universe might eventually reach about 60 billion light-years. But the universe is expanding so fast that we'd never see any farther — limiting us to a bubble of space and time inside a possibly infinite universe. We'll have more about the observable universe tomorrow.  Script by Damond Benningfield Support McDonald Observatory

script observable universe
SpaceOut
The Observable Universe - Explained

SpaceOut

Play Episode Listen Later Jun 28, 2022 9:43


What is the observable universe? Go to anchor.fm to start your podcast now. --- This episode is sponsored by · Anchor: The easiest way to make a podcast. https://anchor.fm/app

observable universe
Universe Today Podcast
833: Interview with Fraser: Defending My Belief That We're Alone in the Observable Universe

Universe Today Podcast

Play Episode Listen Later May 30, 2022 87:03 Very Popular


Universe Today Podcast
833: Interview with Fraser: Defending My Belief That We're Alone in the Observable Universe

Universe Today Podcast

Play Episode Listen Later May 30, 2022


Support Universe Today Podcast

belief defending fraser observable universe
The Whole Rabbit
Beyond the Milky Way...

The Whole Rabbit

Play Episode Listen Later May 22, 2022 50:09


Take your protein pills, put your helmet on and begin the countdown because this week sees us venturing into the vast, unimaginably enormous, and unthinkably strange state of all physical reality that humanity has dubbed innocuously as “space.” Journey with us in a crash course through the big bang, crunch, bounce, super-massive-black holes and get to know what higher order super-organism cannibalistic galaxies are creating in the boiling soup of SPACE!!!In this week's episode we discuss:-The Milky Mammaries?-How Old is Space?-Hathoor-Space is Glowing-How Big is Space?-The Observable Universe-GNz-11 Galaxy-Cosmic Microwave Background Radiation-The Big Bang, Crunch and Bounce-Dark Energy-Dark MatterIn the extended show available at www.patreon.com/TheWholeRabbit we discuss:-The Four Fundamental Forces-The Devil Card-Periodic Table of Elements-PADME Black Crystal Experiments-Laniakea Supercluster-Blackholes and Galactic Centers-Astronaut Religious Experience-Cannibalistic Galaxies-Spirituality of Space-Laika the DogMusic By:Spirit Travel Plazahttps://open.spotify.com/artist/30dW3WB1sYofnow7y3V0YoWhere to find The Whole Rabbit:YouTube: https://youtu.be/z4DL6BFdzfMMerch: https://shop.spreadshirt.com/thewholerabbit/Spotify: https://open.spotify.com/show/0AnJZhmPzaby04afmEWOAVInstagram: https://www.instagram.com/the_whole_rabbitSpace is Full of Light:https://www.travelandleisure.com/trip-ideas/space-astronomy/nasa-scientists-discover-outer-space-isnt-pitch-blackBig Bounce:https://phys.org/news/2016-07-big.amphttps://cosmolearning.org/courses/roger-penrose-lecture-before-the-big-bang/https://link.aps.org/doi/10.1103/PhysRevLett.117.021301Modern Physics & Philosophy:https://www.google.com/url?sa=t&source=web&rct=j&url=https://philpapers.org/archive/STEWMP-3.pdf&ved=2ahUKEwjYpZ2ci-X3AhVRFjQIHTzHCLQQFnoECAYQAQ&usg=AOvVaw0sbMu6-FR9jeBkzx3T15GgPre-Big Bang - Dark Matter from Scalar Field Fluctuations:https://link.aps.org/doi/10.1103/PhysRevLett.123.061302Subatomic Particles:https://arxiv.org/abs/2106.03744https://www.livescience.com/62207-higgs-field-instanton-destroy-universe.htmlhttps://physicsworld.com/a/physicists-target-the-dark-photon/Galactic Centers:https://www.astro.ucla.edu/~tdo/gal_center.html#:~:text=The%20center%20of%20the%20Galaxy,stars%20closest%20the%20black%20holeSupport the show

ប្រវត្តិសាស្រ្តពិភពលោក
តេឡេស្កុបអវកាសជេមស៍វេប​មាន​លក្ខណៈពិសេស​អ្វីខ្លះ?

ប្រវត្តិសាស្រ្តពិភពលោក

Play Episode Listen Later Sep 27, 2021 7:51


តេឡេស្កុបអវកាស​ជេមស៍វេប (James Webb Space Telescope) ដែល​គេ​គ្រោង​បាញ់បង្ហោះ នៅចុងឆ្នាំ២០២១​នេះ ត្រូវបាន​គេ​ចាត់ទុក​ថា​ជា​តេឡេស្កុប​ដ៏​ទំនើប​បំផុត​មួយ ហើយ​ដែល​អ្នក​វិទ្យាសាស្រ្ត​កំពុង​ទន្ទឹង​រង់ចាំ ដើម្បី​អាច​ប្រើ​តេឡេស្កុប​នេះ​សិក្សា​លម្អិត​ទៅលើ​ចក្រវាល រាប់ចាប់តាំង​ពី​ការ​សង្កេត​មើល​ផ្កាយ និង​កាឡាក់ស៊ី​ដំបូងៗ​ក្រោយ​ហេតុការណ៍​ប៊ីកប៊ែង រហូត​ដល់​ការ​សិក្សា​លម្អិត​ទៅលើ​ធាតុផ្សំ​នៃ​បរិយាកាស​លើ​ភព​ក្រៅប្រព័ន្ធ​ព្រះអាទិត្យ។ តេឡេស្កុបអវកាស​ជេមស៍វេប (James Webb) ជាគម្រោង​រួមគ្នា រវាង​ទីភ្នាក់ងារ​អវកាស​អាមេរិក​​ណាសា ទីភ្នាក់អវកាស​អឺរ៉ុប​អេសា និង​ទីភ្នាក់ងារ​អវកាស​កាណាដា។ សាងសង់​ក្នុង​គម្រោង ដែល​ត្រូវ​ចំណាយ​លុយ​រហូតដល់​ទៅ ១០ពាន់​លានដុល្លារ តេឡេស្កុបជេមស៍វេប មានកែវ​ដែលមាន​មុខកាត់​រហូតដល់​ទៅ ៦ម៉ែត្រកន្លះ ពោលគឺ ធំជាង​កែវ​តេឡេស្កុប​ហឺបល​ដល់​ទៅ ៦ដងឯណោះ។ ក្រៅពីមាន​មុខកាត់កែវ​ធំ​អាច​ចាប់ពន្លឺ​បាន​ច្រើន​នេះ តេឡេស្កុប​ជេមស៍វេប​នៅមាន​លក្ខណៈពិសេស​ចម្បងមួយទៀត គឺ​អាច​ចាប់ពន្លឺអាំងហ្វ្រារូ (Infrarouge/Infrared) នៅ​ក្នុង​ហ្វ្រេកង់​យ៉ាងទាបដែល​តេឡេស្កុបហឺបល​មិន​អាច​ចាប់បាន។ សមត្ថភាព​ក្នុងការ​ចាប់ពន្លឺ​ក្នុង​ហ្វ្រេកង់​យ៉ាងទាប​នេះ វាជា​ចំណុច​សំខាន់ ដើម្បី​ឆ្លុះមើល​ផ្កាយ និង​កាឡាក់ស៊ី ដែល​នៅ​ឆ្ងាយៗ​ រហូត​ដល់​ជាយ​នៃ​ចក្រវាល​ដែល​គេហៅថា Observable Universe ហើយ​អាច​ឲ្យ​យើង​សង្កេត និង​សិក្សាស្វែងយល់ អំពី​ការ​កកើត​ផ្កាយ និង​កាឡាក់ស៊ី​ដំបូងៗ​បំផុត នៅមិនយូរប៉ុន្មាន​ក្រោយ​ហេតុការណ៍ប៊ីកប៊ែង។ តេឡេស្កុបជេមស៍វេប​នេះ​ក៏​មាន​សមត្ថភាព​ផងដែរ ក្នុងការ​សិក្សា​លម្អិត ដើម្បី​កំណត់​ធាតុផ្សំ​នៃ​បរិយាកាស​នៅលើ​ភព​ក្រៅប្រព័ន្ធ​ព្រះអាទិត្យ ដែល​នេះ​ជា​គន្លឹះ​ដ៏​សំខាន់​មួយ នៅ​ក្នុងការ​សិក្សា អំពី​លទ្ធភាព​នៃ​វត្តមាន​ជីវិត​ក្រៅភពផែនដី។ តាមគម្រោង តេឡេស្កុប​ជេមស៍វេប​​នឹង​ត្រូវ​គេ​បាញ់បង្ហោះ នៅថ្ងៃទី១៨ ខែធ្នូ​ ឆ្នាំ២០២១ ដោយ​ប្រើ​រ៉ុកកែត​អារីយ៉ាន-៥ (Ariane-5) បាញ់ចេញ​ពី​មជ្ឈមណ្ឌលអវកាស​គូរូ ក្នុង​ដែនដី​ហ្គីយ៉ាន​របស់​បារាំង។ ជេមស៍វេប​នឹង​ត្រូវ​បាញ់បង្ហោះ​ទៅដាក់​ក្នុង​គន្លង​តារាវិថី​ជុំវិញ​ព្រះអាទិត្យ ហើយ​ស្ថិត​នៅ​ចម្ងាយ​ប្រមាណ​ជា ១,៥លាន​គីឡូម៉ែត្រ​ពីផែនដី (ឆ្ងាយ​ជាង​ចម្ងាយរវាង​ផែនដី​និង​ព្រះចន្ទ​រហូតដល់​ទៅ៤ដង)៕

Note to Self
6. Claudia Graziano: A Night on the Ballsack Couch, Influencing & Escaping the Observable Universe (lol)

Note to Self

Play Episode Listen Later Jun 22, 2021 63:26


In this episode, after a few big life updates from P, we are crawling up on the ballsack couch with my good friend, Claudia Graziano. Over a glass (or two) of wine, we discuss topics ranging from bonding over mental illness, to our dream lives on a remote island, to attempting to escape the observable Universe because TikTok told us we can't. It's a conversation among friends, but with all of us.  Claudia's Instagram - http://instagram.com/claudiagraziano/ Twitter - http://twitter.com/ntspod Instagram - http://instagram.com/paytonsartain YouTube - https://youtube.com/paytonsartainhh Full Disclosure - http://shopfulldisclosure.com/

Atlanta Fringe Audio
The Observable Universe by Jack Walsh

Atlanta Fringe Audio

Play Episode Listen Later Jun 1, 2021 16:54


A latchkey teen has to think fast when his grandfather becomes One With The Cosmos. It's pretty inconvenient, TBH. And thinking fast isn't really his thing.

tbh jack walsh observable universe
Daniel and Jorge Explain the Universe
Listener Questions: the expanding observable Universe, what it's like to be a photon and the age of the Universe

Daniel and Jorge Explain the Universe

Play Episode Listen Later May 25, 2021 46:22


Daniel answers questions from listeners like you! Got questions? Come to Daniel's public office hours: https://sites.uci.edu/daniel/public-office-hours/ Learn more about your ad-choices at https://www.iheartpodcastnetwork.com

Atlanta Fringe Audio
2021 Fringe Audio Promo: Observable Universe by Jack Walsh

Atlanta Fringe Audio

Play Episode Listen Later May 20, 2021 1:12


promo fringe jack walsh observable universe
WORLD OF SCIENCE
Episode 7 - Observable Universe, Hubble Deep Field & The Redshift Effect

WORLD OF SCIENCE

Play Episode Listen Later May 5, 2021 5:51


Count The Stars With Science Boy! This is a fun and humorous educational video about the Observable Universe, Hubble Deep Field and the Redshift phenomenon. #ScienceBoy #FunTimeLab #Universe #space #science #spacetechnology #Hubble #deepfield #redshift #kids #astronomy #kidsshow https://youtu.be/2RNrd7cgC5c --- This episode is sponsored by · Anchor: The easiest way to make a podcast. https://anchor.fm/app Support this podcast: https://anchor.fm/fun-time-lab/support

hubble redshift deep field observable universe
Planet B612
Ep.38 – The science of the universe with Islam Khan

Planet B612

Play Episode Listen Later Apr 13, 2021 57:53


In this episode, I’m speaking with early universe cosmologist Islam Khan. We talk about inflation theory, the multiverse, dark matter, and so much more! Is there such a thing as a parallel universe? Do we know why the universe has stretched? What does a cosmologist do for fun?  (0:00:50) What does a Cosmologist do?  (0:01:48) Islam Khan's journey into studying cosmology (0:04:50) The Infinite Universe vs The Observable Universe  (0:06:30) The Milky Way in the cosmic web (0:07:50) The scale of the Observable Universe (0:09:30) Are we alone out here? The possibility of alien life (0:11:50) The Inflation Theory - our stretchy Universe (0:12:45) How do we know it stretched? (0:13:30) The painting analogy  (0:14:35) How the Inflation Theory explains these problems (0:15:52) Multiverses: a consequence of inflation. What are they? (0:16:32) Max Tegmark - defining the four levels (0:17:55) Level 1: Inflation fields, Quantum Fields and the Higgs Boson (0:19:24) Level 2: Bubbles of Universes  (0:20:02) Level 3: The Many Worlds Theory (0:22:10) Level 4: An Abstract view: Changing the laws of physics (0:23:30) Do doppelgangers actually exist?  (0:24:20) Wave Function Collapse - Schrödinger's cat and Hugh Everett's theory  (0:26:03) Are we just a simulation?  (0:27:25) What caused the inflation? The ball and the hill  (0:29:10) Reheating the Universe  (0:30:25) Unifying Inflation Theory and dark energy/dark matter (0:31:45) The Theory of Everything (0:32:45) The real world applications - answering the big questions (0:34:46) The second stretching phase - what's happening now (0:35:50) Einstein's Cosmological Constant (0:37:35) Accelerated Expansion and Earth (0:40:00) Particle Cosmology - not just math (0:41:15) The Philosophical side (0:42:38) The Anthropic Principle (0:43:25) Evidence over opinion - why we can't all get along  (0:44:45) Working together - you need more than Theorists to make a theory (0:46:25) Exciting advances in research today! Stepping on Mars! New particles and more! (0:49:15) Islam Khan's interests; soccer, guitar and travel (0:52:25) Science and the arts - is there a link? (0:54:15) Conversations and discussions - other fields of interest  (0:56:20) Research is the dream Follow Islam Khan on Twitter: https://twitter.com/KhanCosmologist Islam Khan on LinkedIn: https://www.linkedin.com/in/islam-khan-001915/ Visit Planet B612 on the web: http://planetb612.fm/ Follow Planet B612 on Twitter: https://twitter.com/PlanetB612fm Support Planet B612 on Patreon: https://patreon.com/juliesworld

Bitcoin para todos
Qué representan las 12 palabras? Por qué son tan importantes? - Episodio #15

Bitcoin para todos

Play Episode Listen Later Dec 6, 2020 22:24


En este episodio intento explicar qué son las 12 palabras y porque son tan relevantes en la administración de custodia de bitcoins. Creo que un mínimo conocimiento es indispensable para poder tomar decisiones con responsabilidad! También agrego una muy buena explicación de Andreas Antonopolous que pueden ver en youtube: Can Someone Guess My Crypto Private Key? [From Sand, to Molecules, to the Observable Universe]. --- Send in a voice message: https://anchor.fm/diego-torres3/message

Souravism
Beyond Our Observable Universe

Souravism

Play Episode Listen Later Jul 24, 2020 5:11


Can technology take us to the edge and beyond our observable universe? Is parallel universe real? I try to explain in simple words about theories of our observable universe and what lies beyond.

observable universe
DTransfer
The Age of the Universe Conundrum 2: Concerning the Stretching or Expansion of the Universe and Einstein's Bias

DTransfer

Play Episode Listen Later Jul 8, 2020 32:23


In this episode, I look at the expanding Universe and time dilation as two important concepts to understand a potential equivalence between the Bible's claim (Six days of Creation and Few thousand years of the existence of the Universe) and the Modern Science's observed 13.8 to 15 billion years of the Universe existence.  In addition, I spoke about how prejudice and bias can lead a person to miss FACTS and ultimately TRUTH: Einstein's case of introduction of the infamous cosmological constant being an example. Where Einstein said that introducing that constant contrary to what His model predicted was the greatest blunder of His life. PS:The diameter of the Observable Universe is about 93 Billion Light years in diameter. About 9 x10^26m in diameter

Universe Today Podcast
Episode 618: The Future Of Gravitational Waves. Seeing Every Black Hole Collision In The Observable Universe?

Universe Today Podcast

Play Episode Listen Later Jan 24, 2020


In 2015, scientists discovered the telltale signal from ripples of spacetime sweeping over the Earth. It was the very first direct detection of gravitational waves, generated by the merger of two massive black holes 1.3 billion light-years away. This discovery was the culmination of decades of research and construction of huge instruments called interferometers to detect the warping of spacetime caused by gravitational waves. Today, the most advanced detectors, the LIGO/VIRGO collaboration, have turned up over 50 gravitational wave discoveries - on average one every week - allowing astronomers to perceive the Universe in a completely different way. What new gravitational wave instruments are in the works, and what does the future hold for this relatively new field of study? Our Book is out! https://www.amazon.com/Universe-Today-Ultimate-Viewing-Cosmos/dp/1624145442/ Audio Podcast version: ITunes: https://itunes.apple.com/us/podcast/universe-today-guide-to-space-audio/id794058155?mt=2 RSS: https://www.universetoday.com/audio Weekly email newsletter: https://www.universetoday.com/newsletter Weekly Space Hangout: https://www.youtube.com/channel/UC0-KklSGlCiJDwOPdR2EUcg/ Astronomy Cast: https://www.youtube.com/channel/UCUHI67dh9jEO2rvK--MdCSg Support us at https://www.patreon.com/universetoday More stories at https://www.universetoday.com/ Twitch: https://twitch.tv/fcain Twitter: @universetoday Facebook: https://www.facebook.com/universetoday Instagram - https://instagram.com/universetoday Team: Fraser Cain - @fcain / frasercain@gmail.com Karla Thompson - @karlaii / https://www.youtube.com/channel/UCEItkORQYd4Wf0TpgYI_1fw Chad Weber - weber.chad@gmail.com References: https://www.ligo.caltech.edu/page/what-is-interferometer https://www.ligo.caltech.edu/system/media_files/binaries/313/original/LIGOHistory.pdf https://gwcenter.icrr.u-tokyo.ac.jp/en/plan http://www.gw-indigo.org/tiki-index.php https://www.osa-opn.org/home/articles/volume_29/may_2018/features/gravitational_waves_the_road_ahead/ http://www.et-gw.eu/ https://tds.virgo-gw.eu/?call_file=ET-0106C-10.pdf https://cosmicexplorer.org/ https://arxiv.org/ftp/arxiv/papers/1907/1907.04833.pdf https://sci.esa.int/web/lisa/-/61367-mission-summary https://sci.esa.int/web/lisa-pathfinder/-/59238-lisa-pathfinder-to-conclude-trailblazing-mission https://arxiv.org/pdf/1907.11305.pdfSupport Universe Today Podcast

earth universe twitch references black holes collisions gravitational waves our book astronomy cast observable universe ligo virgo weekly space hangout universe today ultimate viewing cosmos
Universe Today Podcast
Episode 618: The Future Of Gravitational Waves. Seeing Every Black Hole Collision In The Observable Universe?

Universe Today Podcast

Play Episode Listen Later Jan 24, 2020 14:39


In 2015, scientists discovered the telltale signal from ripples of spacetime sweeping over the Earth. It was the very first direct detection of gravitational waves, generated by the merger of two massive black holes 1.3 billion light-years away. This discovery was the culmination of decades of research and construction of huge instruments called interferometers to detect the warping of spacetime caused by gravitational waves. Today, the most advanced detectors, the LIGO/VIRGO collaboration, have turned up over 50 gravitational wave discoveries - on average one every week - allowing astronomers to perceive the Universe in a completely different way. What new gravitational wave instruments are in the works, and what does the future hold for this relatively new field of study? Our Book is out! https://www.amazon.com/Universe-Today-Ultimate-Viewing-Cosmos/dp/1624145442/ Audio Podcast version: ITunes: https://itunes.apple.com/us/podcast/universe-today-guide-to-space-audio/id794058155?mt=2 RSS: https://www.universetoday.com/audio Weekly email newsletter: https://www.universetoday.com/newsletter Weekly Space Hangout: https://www.youtube.com/channel/UC0-KklSGlCiJDwOPdR2EUcg/ Astronomy Cast: https://www.youtube.com/channel/UCUHI67dh9jEO2rvK--MdCSg Support us at https://www.patreon.com/universetoday More stories at https://www.universetoday.com/ Twitch: https://twitch.tv/fcain Twitter: @universetoday Facebook: https://www.facebook.com/universetoday Instagram - https://instagram.com/universetoday Team: Fraser Cain - @fcain / frasercain@gmail.com Karla Thompson - @karlaii / https://www.youtube.com/channel/UCEItkORQYd4Wf0TpgYI_1fw Chad Weber - weber.chad@gmail.com References: https://www.ligo.caltech.edu/page/what-is-interferometer https://www.ligo.caltech.edu/system/mediafiles/binaries/313/original/LIGOHistory.pdf https://gwcenter.icrr.u-tokyo.ac.jp/en/plan http://www.gw-indigo.org/tiki-index.php https://www.osa-opn.org/home/articles/volume29/may2018/features/gravitationalwavestheroadahead/ http://www.et-gw.eu/ https://tds.virgo-gw.eu/?callfile=ET-0106C-10.pdf https://cosmicexplorer.org/ https://arxiv.org/ftp/arxiv/papers/1907/1907.04833.pdf https://sci.esa.int/web/lisa/-/61367-mission-summary https://sci.esa.int/web/lisa-pathfinder/-/59238-lisa-pathfinder-to-conclude-trailblazing-mission https://arxiv.org/pdf/1907.11305.pdf

Pulteney Street Podcast
Pulteney Street Podcast: Astrophysics and the Observable Universe

Pulteney Street Podcast

Play Episode Listen Later Dec 19, 2019 31:49


Episode 11: Steven Penn In the final episode of the fall semester, President Joyce P. Jacobsen sits down with Associate Professor of Physics Steven Penn on the Pulteney Street Podcast to discuss…

StarTalk Radio
Cosmic Queries – Out There

StarTalk Radio

Play Episode Listen Later Feb 15, 2019 50:00


Neil deGrasse Tyson, co-host Harrison Greenbaum, and astrophysicist Janna Levin answer questions on the far away and the far out, including Andromeda's impending collision with the Milky Way, white holes, a holographic universe, and more. Prepare to get trippy! NOTE: StarTalk All-Access subscribers can watch or listen to this entire episode commercial-free. Photo Credit: NASA; ESA; Z. Levay and R. van der Marel, STScI; T. Hallas; and A. Mellinger

Dr Karl Podcast
Observable universe, new elements and black holes

Dr Karl Podcast

Play Episode Listen Later Jul 11, 2018 33:42


Dr Karl is away for the month, so science journalist Bianca Nogrady is stepping in to be your science sherpa on triple j. And joining her today was Dr Jess Bloom, astrophysicist from the University of Sydney.

university black holes new elements observable universe bianca nogrady
Dr Karl Podcast
Observable universe, new elements and black holes

Dr Karl Podcast

Play Episode Listen Later Jul 11, 2018 33:42


Dr Karl is away for the month, so science journalist Bianca Nogrady is stepping in to be your science sherpa on triple j. And joining her today was Dr Jess Bloom, astrophysicist from the University of Sydney.

university black holes new elements observable universe bianca nogrady
Geekdays
Geekdays #808: The Week Starting June 25th, 2018.

Geekdays

Play Episode Listen Later Jun 27, 2018 27:24


Netflix accounts, video game consoles, life in space. If this isn't your average episode of Geekdays, then I don't know what is. Show notes and links: Here are the People We're Most Commonly Borrowing a Netflix Login From (exstreamist.com) Netflix's approval among Republicans has declined in 2018: Survey (businessinsider.com) PlayStation 4 Was the Best Selling Console for May 2018 (ign.com) Why Is Nintendo's Switch So Successful? It's All About The Marketing (forbes.com) Xbox One won't get VR support after all (techradar.com) Xbox’s next exclusive is an American Girl doll set (polygon.com) Striped displays aren't a defect, here's why they occur (androidauthority.com) Supreme Court Says Cops Need to Get a Warrant to Get Your Phone Location Data (vice.com) Cops Are Confident iPhone Hackers Have Found a Workaround to Apple’s New Security Feature (vice.com) Apple commits to blocking iPhone unlockers used by police (cultofmac.com) Amazon has discontinued the Mayday button on its Fire tablets (thenextweb.com) New Model Predicts That We're Probably the Only Advanced Civilization in the Observable Universe (universetoday.com)

Buffy vs Bauer
BvB101: The Most Importanterer Podcast

Buffy vs Bauer

Play Episode Listen Later Apr 18, 2018 78:50


Buffy vs Bauer, AKA The Most Important Podcast in the Observable Universe, begins anew with Jon Jolley and Mitch Schmidt as they continue their "hero's journey" to answer the eternal question, who is the bigger bad ass, Buffy Summers or Jack Bauer? Jon and Mitch discuss rebooting the show, and fearlessly dive into Buffy the Vampire Slayer Season 1, Episode 1-4. Now, more than ever, is the time to join the Scooby Gang against The Master, a Witch and a Monster... www.LongBallStudios.com

Decipher SciFi : the show about how and why
When Worlds Collide: observable universe, 20th century astonomy, and modern space industry w/ Daniel James Barker

Decipher SciFi : the show about how and why

Play Episode Listen Later Nov 28, 2017 37:32


The “observable” universe The part of the universe that we can, in principle, capture light from as a function of the speed of light and the expansion of the universe. Galactic perspectives Learning more about the breadth and contents of the universe since the 1950s. Hubble and “island universes.” Figuring out there are other galaxies and past and present ideas of just how many there are. The modern space industry Appreciation for where we are finally. Space travel becoming cheaper and cheaper and the legit settlement of other planets on the horizon. When worlds actually collide Spitzer detecting the aftermath of what seems to have been a planetary collision. Other planetary collisions in the history of our own solar system, like the one that produced our moon. Artist's conception of a collision around the star NGC 2547-ID8 NASA/JPL-Caltech The incoming star: Bellus Only 12x the size of earth. Luminosity and distance. What type of star could be in this range of size and luminosity? Herzprung-Russel Star Diagram of star surface temperature and luminosity ESO CC-A-4.0 Uranus Somehow we got to this topic. And now here is some history! Effect on the solar system Oh no! Will the planet be able to find a stable orbit in our solar system after presumably affecting the fairly stable orbits of the other planets? Star system escape velocities. Landing on a new world And not even having time to remark upon the clearly engineered structures on the surface before your whole planet is flung from its sun and everything freezes and you die. :cry: When Worlds Collide by Powerman 5000: YouTube 2000000000000: Uncertainty Principle the Podcast Hubble Deep Field by Vox: YouTube And another about the Hubble "Ultra" Deep Field by Deep Astronomy: YouTube Support the show!

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Ep 1: Far From Home, That's What She Said, Dear, Dreamweavers, Hungry, and An Inexact Science

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Play Episode Listen Later Sep 1, 2017 53:38


0:47 - A Condensed History of the Observable Universe by Patrick Hockberger - https://www.hockberger.com/, https://soundcloud.com/hockberger * * * 1:56 - Clip from Far from home episode 11 “Just Plain Weird” by Scott Gurian - https://farfromhomepodcast.org/, https://itunes.apple.com/us/podcast/far-from-home-podcast/id1091969414?mt=2 * * * 12:11 - Clip from That’s What She Said episode 26 “Boo K” by Therese Barbado - www.thatswhatshesaidpod.com, https://itunes.apple.com/us/podcast/thats-what-she-said/id1105391843?mt=2 * * * 21:26 - Dear episode “Gone” by Davis Land - http://davisland.info, https://itunes.apple.com/us/podcast/dear/id1196046884?mt=2 * * * 27:28 - Clip from Dreamweavers episode “Tod Kelly - Writer” by Harris Newman https://www.dreamweavers.co/, https://itunes.apple.com/us/podcast/dreamweavers/id1223829437?mt=2 * * * 36:31 - Short episode of Hungry “Tootsie Rolls” by Otis Gray www.hungryradio.org, https://itunes.apple.com/us/podcast/hungry/id1030463877?mt=2 * * * 44:11 - Short episode of An Inexact Science “Friday, November 6” by Lisa Cantrell - http://aninexactscience.com/, https://itunes.apple.com/us/podcast/an-inexact-science/id933596511?mt=2 *** Music: Maja by Yusuf Siddiquee *** Vote! http://vote.selects.show/ Additional thanks to Dan Kuebrich, Alex Avila, Robert Du, David Woolston, Rob Rusli, and Diane Wu for comments and suggestions

Astronomy Cast
Ep. 295: The Observable Universe

Astronomy Cast

Play Episode Listen Later May 19, 2013 30:53


AstronomyCast 295: The Observable Universe by Fraser Cain & Dr. Pamela Gay

pamela gay astronomy cast observable universe
23. The Big Bang, Inflation, and General Cosmology 2
Size of the Observable Universe

23. The Big Bang, Inflation, and General Cosmology 2

Play Episode Listen Later Jul 28, 2011 1:41


Transcript: The fact that the early universe had a phase of superluminal or faster than light expansion means that it is not trivial to calculate the size of the observable universe. In other words the following simple idea does not work. The universe is eleven or twelve billion years old, so we might imagine that it must be eleven or twelve billion lightyears across. That’s not true because the early expansion was so rapid. Galaxies early in the expansion were being carried apart faster than the speed of light. Later on they were moving apart less rapidly, and eventually the light became able to reach us. So depending exactly on the cosmological model, the size of the observable universe is twenty-five to thirty billion lightyears across. The observable universe represents the horizon, the distance we can see or the distance within which light has had time to reach us in the history of the universe and the cosmic expansion. Given that we think that the universe is now accelerating, the future of the observable universe is very interesting. Acceleration, if it continues, will gradually take galaxies out of our horizon and away from being visible. So over long periods of time the accelerating universe will remove objects from our view. Over a time scale of many billions of years there will actually be less and less to study. Observational astronomy will not last forever. In the end, the acceleration will cause the only galaxies to be visible to be those that are bound to the Milky Way itself.

23. The Big Bang, Inflation, and General Cosmology 2

Transcript: Astronomers make a distinction between the physical universe, all that there is, and the observable universe, all that we can see. The distinction comes about because early in the cosmic expansion any two points in space were separating at faster than the velocity of light. This sounds like a violation of relativity. Special relativity however, which says that the velocity of light is the maximum speed for any signal applies, only to local reference frames. General relativity is the theory that governs the cosmic expansion, and general relativity places no speed limit on the expansion of the big bang. The time when points were moving apart faster than the velocity of light was a time about five billion years ago when the universe was forty percent of its current size or redshift of 1.25. Back much further, three hundred thousand years after the big bang at the time of the microwave background radiation, points in space were moving apart at forty times the velocity of light. Thus there are regions of physical space that we have never seen in the history of the universe, implying that the physical universe is potentially much larger than the observable universe.

observable universe