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February 17, 2020
A brand new telescope has completed on Maui's Haleakala, and it has just one job: to watch the Sun in unprecedented detail. It's called the Daniel K. Inouye telescope, and the engineering involved to get this telescope operational are matched by the incredible resolution of its first images.
February 10, 2020
We've been following this story for more than a decade, so it's great to finally have an answer to the question, why was supernova 2006gy so insanely bright? Astronomers originally thought it was an example of a supermassive star exploding, but new evidence provides an even more fascinating answer.
February 3, 2020
On the one hand, red dwarfs are the longest lived stars in the Universe, the perfect place for life to hang out for trillions of years. On the other hand, they're tempestuous little balls of plasma, hurling out catastrophic flares that could wipe away life. Are they good or bad places to live?
January 27, 2020
For the longest time astronomers could only study the skies with telescopes. But then new techniques and technologies were developed to help us see in different wavelengths. Now astronomers can study objects in both visible light, neutrinos, gravitational waves and more. The era of multi-messenger astronomy is here.
January 19, 2020
The other big issue at the AAS was the challenge that astronomy is going to face from all the new satellite constellations coming shortly. There are already 180 Starlinks in orbit, and thousands more are coming, not to mention the other constellations in the works. What will be the impact on astronomy, and what can we do about it?
January 13, 2020
This week we're live at the American Astronomical Society's 235th meeting in Honolulu, Hawai'i. We learned about new planets, black holes and star formation, but the big issue hanging over the whole conference is the protests and politics over the new Thirty Meter Telescope due for construction on Mauna Kea.
December 30, 2019
It's hard to believe it, but we survived another trip around the Sun. Now it's time to take the whole journey all over again, but with new news. Let's take a look at some of the space and astronomy stories we're looking forward to in 2020.
December 23, 2019
Huge surveys of the sky are finding more and more planets, stars and galaxies. But they're also turning up strange objects astronomers have never seen before, like Boyajian's star. Today we're going to talk about some unusual objects astronomers have discovered, and why this number is only going to go way way up.
December 20, 2019
Hi everyone, Producer Susie here. This weekend, December 21-23, 2019, we will be having our CosmoQuest Hangoutathon.  For 40 straight hours, our team will be bringing you guests, science and fun live on our channel. We are raising money to pay for our team to continue to bring you science, and for us to continue our citizen science programs, like the extremely successful Bennu Mappers from this past year, where over 3500 of you wonderful volunteers mapped over 14 million rocks on the asteroid Bennu, looking for a safe place for the OSIRIS-REx mission to grab samples to return to earth.  We want to keep doing projects like this - and we need your help to continue doing the science.  Please join us at starting 9am EST / 6am PST / 1400UTC. If you can’t tune in live, you can catch the replays on Twitch, and we’ll be trying our best to archive all of the content on YouTube after this weekend. We’re accepting donations at As part of the Planetary Science Institute, we are a 501c3 non-profit, so all of your donations are tax deductible where the law allows.  Please watch, share and donate if you can, so we can keep bringing the science to you! Thank you for listening!
December 16, 2019
The Cosmic Microwave Background Radiation is the earliest moment in the Universe that we can see with our telescopes, just a few hundred thousand years after the Big Bang itself. What will it take for us to be able to fill in the missing gap? To see closer to the beginning of time itself?
December 7, 2019
Powerful observatories like Hubble and the Very Large Telescope have pushed our vision billions of light-years into the Universe, allowing us to see further and further back in time. But there are regions which we still haven't seen: the Cosmic Dark Ages. What's it going to take to observe some of these earliest moments in the Universe?
December 2, 2019
Last week we gave you an update on the formation of elements from the Big Bang and in main sequence stars like the Sun. This week, we wrap up with a bang, talking about the death of the most massive stars and how they seed the Universe with heavier elements.
November 25, 2019
The Universe started out with hydrogen and helium and a few other elements, but all around us, there are other, more proton-rich elements. We believe these heavier elements formed in stars, but which stars? And at what points in their lives? Today we'll update our knowledge with the latest science.
November 18, 2019
Few sciences have been able to take advantage of the power of computers like astronomy. But with all this computing power, you might be surprised to learn how important a role humans still play in this science.
November 11, 2019
Before we discovered other planets, our Solar System seemed like a perfectly reasonable template for everywhere. But now we see massive planets close to their stars, which leads you to the question, how does it all get there. Do the planets form in place or do they migrate around?
November 5, 2019
Things used to be so simple. Comets were snowballs from the outer Solar System, and asteroids were rocks from the inner Solar System. But now everything's all shades of grey. Astronomers have found asteroids that behave like comets and comets that behave like asteroids.
October 28, 2019
Once again, another place where the Universe is going to make this difficult for us. Proving, once and for all that there's alien life on another world. It should be straightforward, look for biosignatures, but it looks like there are natural sources that could explain almost any chemical we could hope to search for.
October 21, 2019
Got clear skies? Go out tonight and catch the Orionids Meteor shower, a storm of falling stars generated by Halley's comet. Later this week, we'll see aurora like those that will one day be predicted by the ESA Solar Probe. We also have an update on the Mars 2020 rover.
October 20, 2019
Our series on Universe weirdness marches on. This week we take a look at the habitable zone, and how things aren’t as simple as we thought. In this episode we mentioned donations.
October 14, 2019
Our series on Universe weirdness continues, this time we learn how astronomers are struggling to make sense of the age of the Universe.
October 7, 2019
541: Weird Issues: Expansion Rate of the Universe Astronomy Cast 541: Weird Issues: Expansion Rate of the Universe by Fraser Cain & Dr. Pamela Gay Just when the Universe was starting to make sense, the cosmos throws a curveball at us. Astronomers have been trying to accurately measure the expansion rate of the Universe as far back as Hubble. It's been tough to nail down, and now astronomers are starting to figure out why.
September 30, 2019
As astronomers started to discover planets orbiting other stars, they immediately realized that their expectations would need to be tossed out. Hot jupiters? Pulsars with planets? We're now decades into this task, and the Universe is continuing to surprise us.
September 23, 2019
How old are Saturn's rings? They could be brand new, or they could be as ancient as the Solar System itself. Planetary scientists thought they knew the answer thanks to new data from Cassini, but new ideas are calling even that into question.
September 16, 2019
Thanks to all the work from Hayabusa 2 and OSIRIS-REx, astronomers are getting a much better look at the smaller asteroids in the Solar System. It turns out, they're piles of rubble... but fascinating piles of rubble. Let's talk about what we've learned so far.
September 9, 2019
537: Reusable Rocket Revolution Astronomy Cast 537: Reusable Rocket Revolution by Fraser Cain & Dr. Pamela Gay We took a hiatus this summer, but SpaceX sure didn’t, with the tests of the Starhopper prototype. Today we’re going to talk about the revolution in reusable rocketry and quest to build a fully reusable two-stage rocket.
August 10, 2019
Please help us keep bringing you content by going to http://survey.libsyn.com/astronomycast and filling out the survey, so Libsyn can find us sponsors for Astronomy Cast!
July 1, 2019
Astronomy Cast will be on hiatus for July and August. Don't worry, we'll be back in September, and we might just have surprises for you all along this summer! Don't forget you can still catch Pamela with Daily Space, rocket launches and specials on CosmoQuest's Twitch channel, and you can find all the space news and videos from Fraser at Universe Today! We usually record Astronomy Cast every Friday at 3:00 pm EDT / 12:00 pm PDT / 19:00 UTC. You can watch us live on here on AstronomyCast.com, or the AstronomyCast YouTube page.
July 1, 2019
536: Everyday Relativity Astronomy Cast 536: Everyday Relativity by Fraser Cain & Dr. Pamela Gay Relativity is used in more day to day situations than you may realize. In this episode, we will count (some of) the ways. This episode is brought to you live from the All-Stars Star Party in Indian Wells, California.
June 24, 2019
535: Astronomy-Related Things To Do This Summer Astronomy Cast 535: Astronomy-Related Things To Do This Summer by Fraser Cain & Dr. Pamela Gay It's summertime, and time for our annual Astronomy Cast hiatus. But that doesn't mean that the astronomy adventure has to end. Today we'll give you some tips and tricks for astronomy summer adventures.
June 17, 2019
534: Modern South African Astronomy Astronomy Cast 534: Modern South African Astronomy by Fraser Cain & Dr. Pamela Gay You know the drill now. Last week we talked about ancient south African astronomy, and so this week we'll talk about the modern state of astronomy in the southern part of Africa, which happens to be a great place with nice dark skies and a perfect view into the heart of the galaxy.
June 10, 2019
533: Indigenous South African Astronomy Astronomy Cast 533: Indigenous South African Astronomy by Fraser Cain & Dr. Pamela Gay Let's move to another continent this week, and look at the astronomy that was going on in southern Africa in ancient times.
June 3, 2019
532: Modern Astronomy of Australia Astronomy Cast 532: Modern Astronomy of Australia by Fraser Cain & Dr. Pamela Gay Last week we talked about how well the indigenous Australians followed the night sky. Well, it turns out, Australia is still an amazing place for astronomy. There are so many powerful observatories in Australia, and even more in the works.
May 27, 2019
531: Australian Indigenous Astronomy Astronomy Cast 531: Australian Indigenous Astronomy by Fraser Cain & Dr. Pamela Gay South America, especially the Atacama Desert in Chile has become one of the best places in the world to put a telescope. It's dry, high, and the nights are clear. Today we'll talk about the monster telescopes already in operation in this region, and the big ones coming soon.
May 12, 2019
530: Astronomy of the Andes - Then and Now Pt. 2 Astronomy Cast 530: Astronomy of the Andes - Then and Now Pt. 2 by Fraser Cain & Dr. Pamela Gay South America, especially the Atacama Desert in Chile has become one of the best places in the world to put a telescope. It's dry, high, and the nights are clear. Today we'll talk about the monster telescopes already in operation in this region, and the big ones coming soon.
May 6, 2019
529: Astronomy of the Andes - Then and Now Pt. 1 Astronomy Cast 529: Astronomy of the Andes - Then and Now Pt. 1 by Fraser Cain & Dr. Pamela Gay The Andes mountains in South America are a hotspot of astronomy today, but ancient peoples knew it was a great place for astronomy and lived their lives in tune with the night sky. Today we'll learn all about what they knew, and how they mapped the movements of the stars and planets.
April 29, 2019
528: Modern Astronomy of the American Southwest Astronomy Cast 528: Modern Astronomy of the American Southwest by Fraser Cain & Dr. Pamela Gay Last week we talked about the ancient astronomy of the American Southwest. But this is actually Pamela's stomping grounds, and she's spent many a night perched atop mountains in this region staring in the night sky with gigantic telescopes. How does astronomy get done in this region today?
April 22, 2019
527: Ancient Astronomy of the American Southwest Astronomy Cast 527: Ancient Astronomy of the American Southwest by Fraser Cain & Dr. Pamela Gay Ancient peoples had no light pollution, and they knew the night skies very well. In fact, they depends on them to know when to plant and when to harvest. Today Pamela talks about the archeoastronomical sites of the American Southwest.
April 15, 2019
526: Event Horizon Telescope and the Black Hole at M87 Astronomy Cast 526: Event Horizon Telescope and the Black Hole at M87 by Fraser Cain & Dr. Pamela Gay Today, of course, we're going to talk about the announcement from the Event Horizon Telescope and the first photograph of a black hole's event horizon.
April 8, 2019
525: 100 Years of the International Astronomical Union Astronomy Cast 525: 100 Years of the International Astronomical Union by Fraser Cain & Dr. Pamela Gay Even though they might be scattered around our planet, astronomers have way to come together to work out issues that face their entire field of study. It's called the International Astronomical Union, and they're the ones who work out the new names for stars, and sometimes de-planet beloved Kuiper Belt Objects.
April 1, 2019
524: Judging Age & Origins, part 3 - Beyond Our System Astronomy Cast 524: Judging Age & Origins, part 3 - Beyond Our System by Fraser Cain & Dr. Pamela Gay We learned how to figure out the ages of objects in the Solar System, now we push out into the deeper Universe. What about stars, galaxies, and even the Universe itself? How old is it? This episode is part 3 of a series.
March 25, 2019
523: Judging Age & Origins, Pt. 2 Across the Solar System Astronomy Cast 523: Judging Age & Origins, Pt. 2 Across the Solar System by Fraser Cain & Dr. Pamela Gay Today we push our aging curiosity out into the Solar System to ask that simple question: how old is it and how do we know? What techniques do astronomers use to age various objects and regions in the Solar System? This is part two of a series.
March 18, 2019
522: Judging Age & Origins, part 1 - Earth Rocks Astronomy Cast 522: Judging Age & Origins, part 1 - Earth Rocks by Fraser Cain & Dr. Pamela Gay People always want to know how old everything is. And more specifically, they want to know how we know how old everything is. Well, here at Astronomy Cast, it's our job to tell you now only what we know, but how we know what we know. And today we'll begin a series on how we know how old everything is.
March 17, 2019
Bonus: Dust with Dr. Paul Sutter Astronomy Cast Bonus: Dust with Dr. Paul Sutter by Fraser Cain & Dr. Pamela Gay Recorded during the Astrotour to Costa Rica, Fraser talks to Dr. Paul Matt Sutter about the nature of dust and BICEP 2's claim of discovering primordial gravitational waves.
March 11, 2019
521: The Deep Space Network Astronomy Cast 521: The Deep Space Network by Fraser Cain & Dr. Pamela Gay We always focus on the missions, but there's an important glue that holds the whole system together. The Deep Space Network. Today we're going to talk about how this system works and how it communicates with all the spacecraft out there in the Solar System.
March 1, 2019
520: Transients: What They Are and Why They Matter, Part 2 Astronomy Cast 520: Transients: What They Are and Why They Matter, Part 2 by Fraser Cain & Dr. Pamela Gay
February 25, 2019
519: Transients: What They Are and Why They Matter Astronomy Cast 519: Transients: What They Are and Why They Matter by Fraser Cain & Dr. Pamela Gay
February 18, 2019
518: When the Universe tried to Declare War Astronomy Cast 518: When the Universe tried to Declare War by Fraser Cain & Dr. Pamela Gay
February 11, 2019
517: Fritz Zwicky and the Zwicky Transient Facility Astronomy Cast 517: Fritz Zwicky and the Zwicky Transient Facility by Fraser Cain & Dr. Pamela Gay
February 4, 2019
516: Polar Vortices Astronomy Cast 516: Polar Vortices by Fraser Cain & Dr. Pamela Gay
January 28, 2019
515: Space Radiation Astronomy Cast 515: Space Radiation by Fraser Cain & Dr. Pamela Gay
January 21, 2019
514: Planetary Protection Protocols Astronomy Cast 514: Planetary Protection Protocols by Fraser Cain & Dr. Pamela Gay
January 14, 2019
513: Stellar Fusion Astronomy Cast 513: Stellar Fusion by Fraser Cain & Dr. Pamela Gay
January 7, 2019
512: Direct Imaging of Exoplanets Astronomy Cast 512: Direct Imaging of Exoplanets by Fraser Cain & Dr. Pamela Gay
December 31, 2018
511: Predictions for 2019 Astronomy Cast 511: Predictions for 2019 by Fraser Cain & Dr. Pamela Gay
December 24, 2018
510: 2018 - Year in Review Astronomy Cast 510: 2018 - Year in Review by Fraser Cain & Dr. Pamela Gay
December 10, 2018
509: Fiction to Fact: 3D Printers Astronomy Cast 509: Fiction to Fact: 3D Printers by Fraser Cain & Dr. Pamela Gay
December 3, 2018
508: 2018 Holiday Gift Guide Astronomy Cast 508: 2018 Holiday Gift Guide by Fraser Cain & Dr. Pamela Gay
November 27, 2018
507: From Fiction to Fact: Ion Drive Astronomy Cast 507: > From Fiction to Fact: Ion Drive by Fraser Cain & Dr. Pamela Gay
November 17, 2018
506: It’s not Aliens, Unless it’s Aliens Astronomy Cast 506: It’s not Aliens, Unless it’s Aliens by Fraser Cain & Dr. Pamela Gay
November 11, 2018
505: Seismology Astronomy Cast 505: Seismology by Fraser Cain & Dr. Pamela Gay
November 4, 2018
504: Radar, Lidar & Sonar Astronomy Cast 504: Radar, Lidar & Sonar by Fraser Cain & Dr. Pamela Gay
October 29, 2018
503: Gravity Mapping Astronomy Cast 503: Gravity Mapping by Fraser Cain & Dr. Pamela Gay
October 22, 2018
502: No Touching: Determining Composition of Worlds Remotely Astronomy Cast 502: No Touching: Determining Composition of Worlds Remotely by Fraser Cain & Dr. Pamela Gay
October 10, 2018
501: Water Worlds Revisited Astronomy Cast 501: Water Worlds Revisited by Fraser Cain & Dr. Pamela Gay
September 18, 2018
500: Live Celebration! Astronomy Cast 500: Live Celebration! by Fraser Cain & Dr. Pamela Gay
September 10, 2018
499: What is the proposed Hubble-Lemaitre Law? Astronomy Cast 499: What is the proposed Hubble-Lemaitre Law? by Fraser Cain & Dr. Pamela Gay
July 1, 2018
Astronomy Cast will be on hiatus until September, 2018.  When we return, we'll be gearing up for the 500th Episode!
July 1, 2018
498: Dwarf Galaxy Update Astronomy Cast 498: Dwarf Galaxy Update by Fraser Cain & Dr. Pamela Gay
June 25, 2018
497: Update on Globular Clusters Astronomy Cast 497: Update on Globular Clusters by Fraser Cain & Dr. Pamela Gay
June 18, 2018
496: Update on Stellar Populations (I, II, & III) Astronomy Cast 496: Update on Stellar Populations (I, II, & III) by Fraser Cain & Dr. Pamela Gay
June 11, 2018
495: Update on Asteroids & Prospects of Asteroid Mining Astronomy Cast 495: Update on Asteroids & Prospects of Asteroid Mining by Fraser Cain & Dr. Pamela Gay
June 4, 2018
494: Icy Moons Update 2018 Astronomy Cast 494: Icy Moons Update 2018 by Fraser Cain & Dr. Pamela Gay
May 27, 2018
493: Mars Update 2018 Astronomy Cast 493: Mars Update 2018 by Fraser Cain & Dr. Pamela Gay
May 21, 2018
492: Comets, Asteroids and KBO’s Astronomy Cast 492: Comets, Asteroids and KBO’s by Fraser Cain & Dr. Pamela Gay
May 14, 2018
491: Exoplanet Update 2018 Astronomy Cast 491: Exoplanet Update 2018 by Fraser Cain & Dr. Pamela Gay
May 7, 2018
490: What’s New with Supernovae Astronomy Cast 490: What’s New with Supernovae by Fraser Cain & Dr. Pamela Gay
April 30, 2018
489: Black Hole Update Astronomy Cast 489: Black Hole Update by Fraser Cain & Dr. Pamela Gay
April 24, 2018
488: Dark Energy: 2018 Edition Astronomy Cast 488: Dark Energy: 2018 Edition by Fraser Cain & Dr. Pamela Gay
April 16, 2018
487: Dark Matter: 2018 Edition Astronomy Cast 487: Dark Matter: 2018 Edition by Fraser Cain & Dr. Pamela Gay
April 9, 2018
486: Particle Physics Update Astronomy Cast 486: Particle Physics Update by Fraser Cain & Dr. Pamela Gay
March 30, 2018
485: Docking, Refueling, and Transferring Astronomy Cast 485: Docking, Refueling, and Transferring by Fraser Cain & Dr. Pamela Gay
March 26, 2018
484: Transfer Orbits and Gravitational Assists Astronomy Cast 484: Transfer Orbits and Gravitational Assists by Fraser Cain & Dr. Pamela Gay
March 19, 2018
483: Stopping in Space Astronomy Cast 483: Stopping in Space by Fraser Cain & Dr. Pamela Gay
March 12, 2018
482: Alternative Ways to Space Astronomy Cast 482: Alternative Ways to Space by Fraser Cain & Dr. Pamela Gay
March 5, 2018
481: Rockets pt. 3 – Going Faster, Higher, Farther after Fairing Separation Astronomy Cast 481: Rockets pt. 3 – Going Faster, Higher, Farther after Fairing Separation by Fraser Cain & Dr. Pamela Gay
February 27, 2018
This was a special Q&A episode Pamela recorded while Fraser was in Iceland.
February 26, 2018
480: Rockets pt. 2- Multi-stage Boosters Astronomy Cast 480: Rockets pt. 2- Multi-stage Boosters by Fraser Cain & Dr. Pamela Gay
February 19, 2018
479: Rockets pt. 1- What Does “Single Stage To Orbit” Really Mean? Astronomy Cast 479: Rockets pt. 1- What Does “Single Stage To Orbit” Really Mean? by Fraser Cain & Dr. Pamela Gay
February 13, 2018
478: Apollo 8 with Paul Hildebrandt Astronomy Cast 478: Apollo 8 with Paul Hildebrandt by Fraser Cain & Dr. Pamela Gay
February 5, 2018
477: State of Exploration: Once and Future Moon Astronomy Cast 477: State of Exploration: Once and Future Moon by Fraser Cain & Dr. Pamela Gay
January 29, 2018
476: The Overview Effect Astronomy Cast 476: The Overview Effect by Fraser Cain & Dr. Pamela Gay
January 23, 2018
475: Fast Radio Bursts Astronomy Cast 475: Fast Radio Bursts by Fraser Cain & Dr. Pamela Gay
January 15, 2018
474: Predictions for 2018 Astronomy Cast 474: Predictions for 2018 by Fraser Cain & Dr. Pamela Gay
January 8, 2018
473: Remembering the Best Space Science of 2017 Astronomy Cast 473: Remembering the Best Space Science of 2017 by Fraser Cain & Dr. Pamela Gay
December 31, 2017
472: Best Modern Sci Fi for the Science Lover – Part 4: Bioscience Astronomy Cast 472: Best Modern Sci Fi for the Science Lover – Part 4: Bioscience by Fraser Cain & Dr. Pamela Gay
December 27, 2017
471: Best Modern Sci Fi for the Science Lover – Part 3: Human Computer Relations Astronomy Cast 471: Best Modern Sci Fi for the Science Lover – Part 3: Human Computer Relations by Fraser Cain & Dr. Pamela Gay
December 19, 2017
470: Best Modern Sci Fi for the Science Lover – Part 2: 3D Printing Astronomy Cast 470: Best Modern Sci Fi for the Science Lover – Part 2: 3D Printing by Fraser Cain & Dr. Pamela Gay
December 11, 2017
469: Best Modern Sci Fi for the Science Lover – Part 1 Space Exploration Astronomy Cast 469: Best Modern Sci Fi for the Science Lover – Part 1 Space Exploration by Fraser Cain & Dr. Pamela Gay
December 4, 2017
468: Simulations for Science and Fun Astronomy Cast 468: Simulations for Science and Fun by Fraser Cain & Dr. Pamela Gay
November 27, 2017
467: Resonance Astronomy Cast 467: Resonance by Fraser Cain & Dr. Pamela Gay
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