Podcasts about david jewitt

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david jewitt

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Latest podcast episodes about david jewitt

FLASH DIARIO de El Siglo 21 es Hoy
¿Puede un cometa cambiar de sentido?

FLASH DIARIO de El Siglo 21 es Hoy

Play Episode Listen Later Feb 13, 2026 12:13 Transcription Available


El Cometa 41P frenó, se detuvo y cambió sentido tras acercarse al Sol en 2017Por Félix Riaño @LocutorCoUn análisis de imágenes del telescopio Hubble reveló que el cometa 41P invirtió su rotación después del perihelio en 2017En 2017, un cometa de apenas medio kilómetro de diámetro hizo algo que parece imposible. El cometa 41P/Tuttle–Giacobini–Kresák, conocido como 41P, redujo su velocidad de giro de forma drástica cuando se acercó al Sol. Pasó de rotar cada 20 horas a hacerlo cada 53 horas en pocas semanas. Luego desapareció de nuestra vista porque quedó demasiado cerca del Sol desde la perspectiva de la Tierra. Meses después, cuando volvió a ser visible, los datos mostraron algo aún más sorprendente: estaba girando en sentido contrario y completaba una vuelta cada 14,4 horas. ¿Cómo puede un objeto espacial frenar hasta detenerse y luego empezar a girar al revés?¿Y si el cometa se frenó hasta cero?Planteamiento descriptivoPara entender esta historia vamos a empezar por lo básico. Un cometa es una mezcla de roca y hielo que quedó como residuo del nacimiento del Sistema Solar hace unos 4.600 millones de años. Muchos de estos cuerpos viajan en órbitas muy alargadas. El cometa 41P pertenece a la llamada “familia de Júpiter”. Eso significa que su órbita está muy influenciada por la gravedad de Júpiter y que tarda menos de 20 años en dar una vuelta alrededor del Sol. En su caso, tarda unos 5,4 años.En abril de 2017, 41P llegó a su perihelio, que es el punto de la órbita más cercano al Sol. Allí recibió más calor. El hielo comenzó a transformarse en gas, un proceso llamado sublimación. Ese gas salió disparado al espacio y formó una nube llamada coma. También aparecieron chorros, como si fueran pequeñas mangueras naturales que empujan el cometa.Aquí aparece el detalle que lo cambia todo. Cuando esos chorros de gas salen de forma desigual, actúan como pequeños motores. Si el gas sale más fuerte de un lado que de otro, el cometa recibe un empujón que altera su rotación. Es parecido a lo que ocurre cuando soplas una rueda con aire de un solo lado.Observaciones del telescopio espacial Swift de la NASA mostraron que entre marzo y mayo de 2017 el periodo de rotación pasó de 20 horas a 46 y luego hasta 53 horas. Normalmente los cambios en cometas se miden en minutos. Aquí hablamos de decenas de horas. Es un cambio enorme para un objeto tan pequeño, de unos 500 metros de diámetro.Después de mayo, el cometa quedó oculto por el brillo solar. No había datos. Cuando regresó en diciembre, el telescopio espacial Hubble tomó nuevas imágenes. El astrónomo David Jewitt, de la Universidad de California en Los Ángeles, analizó esas fotos años después. Encontró que el periodo era ahora de 14,4 horas. Eso significa que estaba girando más rápido que antes y en sentido contrario. Para que eso ocurra, tuvo que frenar completamente, llegar a cero y empezar a girar al revés. Los cálculos indican que ese punto de detención pudo ocurrir en junio de 2017.Este hallazgo ayuda a responder una pregunta más grande. ¿Por qué hay menos cometas pequeños de los que esperamos encontrar? Una posible explicación es que muchos se destruyen por su propia rotación. Si los chorros los aceleran demasiado, la fuerza centrífuga puede romperlos.El estudio también estimó que el núcleo de 41P mide cerca de 500 metros. Es pequeño en términos astronómicos. Su tamaño lo hace más vulnerable a cambios rápidos. Además, la fracción activa de su superficie, es decir, la parte que libera gas, bajó de aproximadamente 2,4 en 2001 a cerca de 0,14 en 2017. Eso sugiere que su superficie ha cambiado con el tiempo, tal vez formando una capa más dura que bloquea parte del hielo.Aquí hay otro dato inquietante. Aunque su órbita podría mantenerse estable durante unos 10.000 años, el análisis indica que podría romperse por inestabilidad rotacional en unos 25 años si continúa este comportamiento. Eso es muy poco tiempo en términos cósmicos.El cometa volverá a acercarse al Sol en 2028. Los astrónomos estarán atentos. Nuevos telescopios como el Observatorio Vera C. Rubin en Chile van a observar miles de objetos pequeños. Vamos a tener muchos más datos para entender si 41P es un caso raro o si este fenómeno es más común de lo que pensábamos.El cometa 41P fue observado por primera vez en 1858 por Horace Tuttle. Más tarde fue redescubierto por Michel Giacobini en 1907 y por Ľubor Kresák en 1951. Por eso lleva tres apellidos. Su órbita lo lleva desde un punto un poco más cercano al Sol que la órbita de la Tierra hasta más allá de Júpiter.En 1973 tuvo un gran estallido de brillo y alcanzó magnitud 4, lo que significa que pudo verse a simple vista en cielos oscuros. En 2017 volvió a llamar la atención por razones muy distintas.El estudio de David Jewitt fue publicado como prepublicación en arXiv y aceptado en la revista The Astronomical Journal. Otros astrónomos, como Dennis Bodewits y Jane Luu, han señalado que aunque se habían propuesto modelos teóricos donde un cometa podía invertir su rotación, nunca se había observado algo así con datos tan claros.Este caso también nos enseña que los cometas no son rocas inertes. Son cuerpos dinámicos. Cambian, pierden masa, se fracturan y evolucionan cada vez que se acercan al Sol. Son como fósiles activos del origen del Sistema Solar.Resumen final y recomendaciónEl cometa 41P redujo su giro, se detuvo y comenzó a rotar al revés en 2017. Chorros de gas actuaron como motores naturales que cambiaron su velocidad. Podría romperse en pocas décadas. Vamos a seguir atentos a su regreso en 2028.Cuéntame qué te parece esta historia y sigue el pódcast en Spotify: Flash DiarioBibliografíaPhys.org The New York Times IFLScience arXiv – David Jewitt (2026) DOI: 10.48550/arxiv.2602.06403Conviértete en un supporter de este podcast: https://www.spreaker.com/podcast/flash-diario-de-el-siglo-21-es-hoy--5835407/support.Apoya el Flash Diario y escúchalo sin publicidad en el Club de Supporters. 

Clear+Vivid with Alan Alda
David Jewitt and Jane Luu: Is Pluto All Alone Out There?

Clear+Vivid with Alan Alda

Play Episode Listen Later Jun 4, 2024 38:04


That was the question two determined astronomers set out to answer. A frustrating five-year search revealed that Pluto, long thought to be a small, lonely planet on the outer fringes of the solar system, is in fact part of a huge ring of debris left over from the solar system's birth.

pluto david jewitt
Student Ministry Conversations
Tithing As A Church Employee with David Jewitt | SMC Podcast | Episode 155

Student Ministry Conversations

Play Episode Listen Later May 23, 2024 32:35


Welcome to this week's episode where Melissa sits down with David Jewitt, the Associate Pastor at New Hope Church in Abilene, Texas, as they talk about the biblical aspect of tithing and how that affects you as a staff person. Whether you are a young or old youth pastor, we would love for you to listen in and see what is talked about in today's episode and we would also love to hear from you! What is your tidbit of advice that you would add to the conversation?   You can listen to this episode on all your preferred podcast providers.  We would also love to have you join the conversation if you would like to be on the show!   Shoot us a message on social media (@talkstudentmin) or an email (podcast@studentministryconversations.org) to get a time set for you to be on the show.   Show notes can be found on our website: www.studentministryconversations.org     Connect With SMC     Instagram – @talkstudentmin     Twitter – @talkstudentmin    Facebook – @talkstudentmin     Youtube - "Student Ministry Conversations"    Connect With The Hosts     Brent Aiken – @heybrentaiken    Russell Martin – @rgmmusic    David Pruitt - @pruacoustic    Melissa Stevenson - @melissa_stevenson81    Micah Marshall - @micahmarshall   You can also email all the hosts individually by: firstname@studentministryconversations.org   Support the Podcast!     Buy Our Merch! - www.studentministryconversations.org/shop --- Send in a voice message: https://podcasters.spotify.com/pod/show/talkstudentmin/message

Astro arXiv | all categories
The Interstellar Interlopers

Astro arXiv | all categories

Play Episode Listen Later Sep 19, 2022 0:30


The Interstellar Interlopers by David Jewitt et al. on Monday 19 September Interstellar interlopers are bodies formed outside of the solar system but observed passing through it. The first two identified interlopers, 1I/`Oumuamua and 2I/Borisov, exhibited unexpectedly different physical properties. 1I/`Oumuamua appeared unresolved and asteroid-like whereas 2I/Borisov was a more comet-like source of both gas and dust. Both objects moved under the action of non-gravitational acceleration. These interlopers and their divergent properties provide our only window so far onto an enormous and previously unknown galactic population. The number density of such objects is $sim$ 0.1 AU$^{-3}$ which, if uniform across the galactic disk, would imply 10$^{25}$ to 10$^{26}$ similar objects in the Milky Way. The interlopers likely formed in, and were ejected from, the protoplanetary disks of young stars. However, we currently possess too little data to firmly reject other explanations. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.08182v1

interstellar milky way arxiv interlopers 2i borisov david jewitt
Astro arXiv | astro-ph.EP
The Interstellar Interlopers

Astro arXiv | astro-ph.EP

Play Episode Listen Later Sep 19, 2022 0:30


The Interstellar Interlopers by David Jewitt et al. on Monday 19 September Interstellar interlopers are bodies formed outside of the solar system but observed passing through it. The first two identified interlopers, 1I/`Oumuamua and 2I/Borisov, exhibited unexpectedly different physical properties. 1I/`Oumuamua appeared unresolved and asteroid-like whereas 2I/Borisov was a more comet-like source of both gas and dust. Both objects moved under the action of non-gravitational acceleration. These interlopers and their divergent properties provide our only window so far onto an enormous and previously unknown galactic population. The number density of such objects is $sim$ 0.1 AU$^{-3}$ which, if uniform across the galactic disk, would imply 10$^{25}$ to 10$^{26}$ similar objects in the Milky Way. The interlopers likely formed in, and were ejected from, the protoplanetary disks of young stars. However, we currently possess too little data to firmly reject other explanations. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.08182v1

interstellar milky way arxiv interlopers 2i borisov david jewitt
The BreakPoint Podcast
A Comet, Astronomy, and God's Creation

The BreakPoint Podcast

Play Episode Listen Later May 2, 2022 1:04


The Science Hour
How ‘magic mushroom' chemical treats depression

The Science Hour

Play Episode Listen Later Apr 17, 2022 74:31 Very Popular


Brain scanning experiments reveal how psilocybin works to relieve severe depression. Psilocybin is the psychedelic substance in 'magic mushrooms'. The psychoactive chemical is currently in clinical trials in the UK and US as a potential treatment for depression and other mental illnesses. Professor David Nutt of Imperial College London tells Roland about the research Also in the show, worrying findings about the increase in premature deaths because of air pollution in growing cities in tropical Africa and Asia. An international group of climatologists has found that the tropical storms which struck Mozambique, Malawi and Madagascar in early 2022 had been made more intense by human-induced climate change. And astronomer David Jewitt used the Hubble telescope to measure the largest known comet in the solar system - it's huge at about 120 kilometres across. The team at CrowdScience has spent years answering all sorts of listener questions, which must make them pretty smart, right? IN this week's episode, that assumption is rigorously tested as Marnie Chesterton and the team pit their wits against a multitude of mind-bending puzzles from an old TV game show - all in the name of answering a question from Antonia in Cyprus. She wants to know: how do we work out how clever someone is? Is IQ the best measure of cleverness? Why do we put such weight on academic performance? And where does emotional intelligence fit into it all? In the search for answers, presenter Marnie Chesterton and the team are locked in rooms to battle mental, physical, mystery, and skill-based challenges, all against the clock. Unpicking their efforts in the studio are a global team of cleverness researchers: Dr. Stuart Ritchie from Kings College London, Professor Sophie von Stumm from York University, and Dr. Alex Burgoyne, from the Georgia Institute of Technology in the US. They are challenged to face the toughest questions in their field: Why do men and women tend to perform differently in these tests? Is our smartness in our genes? And what about the Flynn effect – where IQs appear to have risen, decade after decade, around the world. (Image: Mexican Psilocybe Cubensis. An adult mushroom raining spores. Credit: Getty Images)

Science in Action
How ‘magic mushroom' chemical treats depression

Science in Action

Play Episode Listen Later Apr 14, 2022 30:48


Brain scanning experiments reveal how psilocybin works to relieve severe depression. Psilocybin is the psychedelic substance in 'magic mushrooms'. The psychoactive chemical is currently in clinical trials in the UK and US as a potential treatment for depression and other mental illnesses. Professor David Nutt of Imperial College London tells Roland about the research Also in the show, worrying findings about the increase in premature deaths because of air pollution in growing cities in tropical Africa and Asia. An international group of climatologists has found that the tropical storms which struck Mozambique, Malawi and Madagascar in early 2022 had been made more intense by human-induced climate change. And astronomer David Jewitt used the Hubble telescope to measure the largest known comet in the solar system - it's huge at about 120 kilometres across. (Image: Mexican Psilocybe Cubensis. An adult mushroom raining spores. Credit: Getty Images) Presenter: Roland Pease Producer: Andrew Luck-Baker

Tumble en Español
Explorando en los límites del Sistema Solar

Tumble en Español

Play Episode Listen Later Apr 8, 2022 18:03


¿Hay bordes o límites en nuestro Sistema Solar? Esa pregunta derivó en un gran descubrimiento revolucionario que cambió completamente la manera en la que vemos el universo. El Cinturón de Kuiper es un campo gigantesco compuesto de pequeños objetos celestes y helados que se encuentran más allá de Neptuno. Estos objetos son restos de la formación de los planetas y por muchísimos años, nadie creía que existían, hasta que los astrónomos Jane Luu y David Jewitt decidieron investigar qué había allá afuera. Jane Luu nos cuenta la historia de cómo ayudó a descubrir el Cinturón de Kuiper. --- This episode is sponsored by · Anchor: The easiest way to make a podcast. https://anchor.fm/app

Tumble Science Podcast for Kids
The Search at Edge of the Solar System

Tumble Science Podcast for Kids

Play Episode Listen Later Feb 22, 2019 17:38


Is there a hard edge to the solar system? This question led to a big, breakthrough discovery that changed the way we picture the solar system - and every other solar system in the universe. The Kuiper Belt is a gigantic field of small, icy objects beyond Neptune, “planet scraps” left over from the formation of the planets. For many, many years, no one believed it might exist. Until astronomers Jane Luu and David Jewitt decided to see what was out there. Jane Luu tells the story of how she helped discover the Kuiper Belt. We have an exciting announcement! We’ve partnered with Castbox to launch Tumble Premium, a channel on the Castbox app featuring ad-free episodes and all our bonus interview episodes too! It’s $1.35/month through the app, or $16/year. You’ll be helping support the show while listening on a great podcast app! Don’t worry, we’ve still got the same great audio extras available on Patreon, too. This week, we have more from our interview with Jane Luu on ‘Oumuamua, the mysterious, weirdly shaped, potentially alien (yes, THAT kind of alien!) space object. Pledge at patreon.com/tumblepodcast. Want to learn more about the Kuiper Belt? Check out our blog at www.sciencepodcastforkids.com.

Don't Panic Geocast
Episode 185 - "I didn't stop running" David Jewitt

Don't Panic Geocast

Play Episode Listen Later Sep 28, 2018 77:20


This week Dr. David Jewitt joins us to talk about interstellar objects, jovian moons, and the Kuiper belt! Kuiper Belt ‘Oumuamua David’s Website Fun Paper Friday Should insurance be paying for you to ride the roller coaster? Find out on this week’s fun paper friday! Mitchell, Marc A., and David D. Wartinger. “Validation of a functional pyelocalyceal renal model for the evaluation of renal calculi passage while riding a roller coaster.” J Am Osteopath Assoc 116.10 (2016): 647–652. Contact us Show - Support us on Patreon! - www.dontpanicgeocast.com - SWUNG Slack - @dontpanicgeo - show@dontpanicgeocast.com John Leeman - www.johnrleeman.com - @geo_leeman Shannon Dulin - @ShannonDulin  

Young Business Leader Podcast
YBT Bonus Podcast September Luncheon David Jewitt

Young Business Leader Podcast

Play Episode Listen Later Sep 18, 2018 28:54


Dave Jewitt stepped out in faith in 2004 at the encouragement of his close network of friends because this network of friends could see the fruit of Dave’s life; when he coached and mentored men, there was a consistent transformation in the man’s life that was being mentored. Eleven years later in 2015 after honing the coaching tools and process, this continues on an international scale. To connect with Dave Jewitt: www.youronedegree.com To learn more about The Young Businessmen of Tulsa: Facebook: /YBTOklahoma Twitter: @ybTulsaOK LinkedIn: Young Businessmen of Tulsa Website: www.ybtok.com To connect with Evan Uyetake www.patreon.com/yblpc twitter: @utalkie instagram: @utalkie LinkedIn: /evanuyetake email: podcast@ybtok.com

eleven luncheon david jewitt
Keck Institute for Space Studies - Video
From Kuiper Belt to Comet

Keck Institute for Space Studies - Video

Play Episode Listen Later Jun 9, 2017 38:02


Watch Prof. David Jewitt from UCLA present his talk From Kuiper Belt to Comet at the Keck Institute for Space Studies short course Comets - Connecting the Origins of Solar Systems to the Origins of Life on June 5, 2017.

Physics (Video)
Planets and Exoplanets

Physics (Video)

Play Episode Listen Later Dec 16, 2011 69:26


David Jewitt, professor of Earth & Space Sciences and Physics & Astronomy at UCLA, gives a modern broad view of our solar system and planetary systems of other stars. Series: "UCLA Science Faculty Research Colloquium" [Science] [Show ID: 21104]

Physics (Audio)
Planets and Exoplanets

Physics (Audio)

Play Episode Listen Later Dec 16, 2011 69:26


David Jewitt, professor of Earth & Space Sciences and Physics & Astronomy at UCLA, gives a modern broad view of our solar system and planetary systems of other stars. Series: "UCLA Science Faculty Research Colloquium" [Science] [Show ID: 21104]

Astronomy (Video)
Planets and Exoplanets

Astronomy (Video)

Play Episode Listen Later Dec 16, 2011 69:26


David Jewitt, professor of Earth & Space Sciences and Physics & Astronomy at UCLA, gives a modern broad view of our solar system and planetary systems of other stars. Series: "UCLA Science Faculty Research Colloquium" [Science] [Show ID: 21104]

Astronomy (Audio)
Planets and Exoplanets

Astronomy (Audio)

Play Episode Listen Later Dec 16, 2011 69:26


David Jewitt, professor of Earth & Space Sciences and Physics & Astronomy at UCLA, gives a modern broad view of our solar system and planetary systems of other stars. Series: "UCLA Science Faculty Research Colloquium" [Science] [Show ID: 21104]