Astronomy Cast
@astronomycast.com
Take a facts-based journey through the cosmos and discover how we know what we know. With hosts Fraser Cain and Dr. Pamela Gay. Recorded live on YouTube.
Join us for a LIVE recording of a double header of science.
Starts 2pm Boston / 11am Vancouver / 7pm London
Ep 783 Cataclysmic Variable Stars
youtube.com/live/hzFgfN2...
Ep 784 Off Label uses of Pulsars
youtube.com/live/4XMJBiJ...
Starts 2pm Boston / 11am Vancouver / 7pm London
Ep 783 Cataclysmic Variable Stars
youtube.com/live/hzFgfN2...
Ep 784 Off Label uses of Pulsars
youtube.com/live/4XMJBiJ...
February 16, 2026 at 5:11 PM
Join us for a LIVE recording of a double header of science.
Starts 2pm Boston / 11am Vancouver / 7pm London
Ep 783 Cataclysmic Variable Stars
youtube.com/live/hzFgfN2...
Ep 784 Off Label uses of Pulsars
youtube.com/live/4XMJBiJ...
Starts 2pm Boston / 11am Vancouver / 7pm London
Ep 783 Cataclysmic Variable Stars
youtube.com/live/hzFgfN2...
Ep 784 Off Label uses of Pulsars
youtube.com/live/4XMJBiJ...
Pamela still has no working boiler, and today Fraser also has some things to deal with. This means we are now aiming for Friday. Thanks for your patience youtube.com/live/sVvY9HG...
February 11, 2026 at 6:52 PM
Pamela still has no working boiler, and today Fraser also has some things to deal with. This means we are now aiming for Friday. Thanks for your patience youtube.com/live/sVvY9HG...
You've probably heard the phrase "Let sleeping dogs lie," but have you heard the phrase "Let sleeping black holes wake up"?
In today's live recording, Fraser & Pamela look at all the ways to black holes wake up & attack their surroundings.
2pm E / 11am P / 1900 UTC
youtube.com/live/PpZRjII...
In today's live recording, Fraser & Pamela look at all the ways to black holes wake up & attack their surroundings.
2pm E / 11am P / 1900 UTC
youtube.com/live/PpZRjII...
February 2, 2026 at 5:49 PM
You've probably heard the phrase "Let sleeping dogs lie," but have you heard the phrase "Let sleeping black holes wake up"?
In today's live recording, Fraser & Pamela look at all the ways to black holes wake up & attack their surroundings.
2pm E / 11am P / 1900 UTC
youtube.com/live/PpZRjII...
In today's live recording, Fraser & Pamela look at all the ways to black holes wake up & attack their surroundings.
2pm E / 11am P / 1900 UTC
youtube.com/live/PpZRjII...
Monday! Monday! Monday!
Our universe is filled with sleeping monsters & sometimes they wake up hungry. In this episode, we take a look at the science behind how and why black holes of all sizes can go from nothing to the triggers of massive high-energy power release.
youtube.com/live/PpZRjII...
Our universe is filled with sleeping monsters & sometimes they wake up hungry. In this episode, we take a look at the science behind how and why black holes of all sizes can go from nothing to the triggers of massive high-energy power release.
youtube.com/live/PpZRjII...
January 31, 2026 at 1:15 AM
Monday! Monday! Monday!
Our universe is filled with sleeping monsters & sometimes they wake up hungry. In this episode, we take a look at the science behind how and why black holes of all sizes can go from nothing to the triggers of massive high-energy power release.
youtube.com/live/PpZRjII...
Our universe is filled with sleeping monsters & sometimes they wake up hungry. In this episode, we take a look at the science behind how and why black holes of all sizes can go from nothing to the triggers of massive high-energy power release.
youtube.com/live/PpZRjII...
Can you do us a favor? If you like our podcast, can you leave us a review wherever you are listening? In the age of the algorithm, this really really helps our show grow.
two women are looking at their cell phones in the dark
ALT: two women are looking at their cell phones in the dark
media.tenor.com
January 30, 2026 at 8:42 PM
Can you do us a favor? If you like our podcast, can you leave us a review wherever you are listening? In the age of the algorithm, this really really helps our show grow.
Sometimes it's nice to dream about an asteroid or comet hitting Earth.
In today's Astronomy Cast, Fraser & Pamela consider the different factors to consider when attacking a planet with an asteroid or comet.
Catch it live at 11am Vancouver / 2pm Boston / 7pm London on youtube.com/live/sIVunut...
In today's Astronomy Cast, Fraser & Pamela consider the different factors to consider when attacking a planet with an asteroid or comet.
Catch it live at 11am Vancouver / 2pm Boston / 7pm London on youtube.com/live/sIVunut...
January 26, 2026 at 6:13 PM
Sometimes it's nice to dream about an asteroid or comet hitting Earth.
In today's Astronomy Cast, Fraser & Pamela consider the different factors to consider when attacking a planet with an asteroid or comet.
Catch it live at 11am Vancouver / 2pm Boston / 7pm London on youtube.com/live/sIVunut...
In today's Astronomy Cast, Fraser & Pamela consider the different factors to consider when attacking a planet with an asteroid or comet.
Catch it live at 11am Vancouver / 2pm Boston / 7pm London on youtube.com/live/sIVunut...
LIVE: #779 Milankovitch Cycles
The Earth's orbit, tilt, and other physical attributes aren't quite as constant as you might think! Come learn how long-term changes do and don't affect our climate.
Recording live at 2pm Boston / 11am Vancouver / 7pm London
youtu.be/rTFbrCIkrfU
The Earth's orbit, tilt, and other physical attributes aren't quite as constant as you might think! Come learn how long-term changes do and don't affect our climate.
Recording live at 2pm Boston / 11am Vancouver / 7pm London
youtu.be/rTFbrCIkrfU
January 12, 2026 at 6:32 PM
LIVE: #779 Milankovitch Cycles
The Earth's orbit, tilt, and other physical attributes aren't quite as constant as you might think! Come learn how long-term changes do and don't affect our climate.
Recording live at 2pm Boston / 11am Vancouver / 7pm London
youtu.be/rTFbrCIkrfU
The Earth's orbit, tilt, and other physical attributes aren't quite as constant as you might think! Come learn how long-term changes do and don't affect our climate.
Recording live at 2pm Boston / 11am Vancouver / 7pm London
youtu.be/rTFbrCIkrfU
Want to hear your name on Astronomy Cast? Join our Patreon at the $10/month level or higher! To be fair, Pamela missed out on phonics, so correct pronunciation isn't guaranteed. Join to hear her mispronounces your name? That is a recommended strategy, actually.
patreon.com/AstronomyCast
patreon.com/AstronomyCast
January 5, 2026 at 9:29 PM
Want to hear your name on Astronomy Cast? Join our Patreon at the $10/month level or higher! To be fair, Pamela missed out on phonics, so correct pronunciation isn't guaranteed. Join to hear her mispronounces your name? That is a recommended strategy, actually.
patreon.com/AstronomyCast
patreon.com/AstronomyCast
This week, @fcain.universetoday.com & @starstryder.space take on Dyson Swarms. Some say they'll solve global warming & the energy crisis. Others look for them as signs of alien civs. These theoretical satellite swarms could be the future (but probably aren't). youtube.com/live/cySk8O0...
January 5, 2026 at 6:42 PM
This week, @fcain.universetoday.com & @starstryder.space take on Dyson Swarms. Some say they'll solve global warming & the energy crisis. Others look for them as signs of alien civs. These theoretical satellite swarms could be the future (but probably aren't). youtube.com/live/cySk8O0...
Why are stars sphere-ish? Why do blackholes not eat everything? Why do pulsating stars pulsate? It all comes down to Eddington.
In today's ep, @fcain.universetoday.com & @starstryder.space look at the Edditngton Limit. Live at 2pm Boston / 7pm London / 11am Vancouver.
youtube.com/live/uijiic8...
In today's ep, @fcain.universetoday.com & @starstryder.space look at the Edditngton Limit. Live at 2pm Boston / 7pm London / 11am Vancouver.
youtube.com/live/uijiic8...
December 29, 2025 at 11:13 PM
Why are stars sphere-ish? Why do blackholes not eat everything? Why do pulsating stars pulsate? It all comes down to Eddington.
In today's ep, @fcain.universetoday.com & @starstryder.space look at the Edditngton Limit. Live at 2pm Boston / 7pm London / 11am Vancouver.
youtube.com/live/uijiic8...
In today's ep, @fcain.universetoday.com & @starstryder.space look at the Edditngton Limit. Live at 2pm Boston / 7pm London / 11am Vancouver.
youtube.com/live/uijiic8...
Why is the universe dominated by Matter? This is the question Fraser and Pamela take on in today's live recording: youtu.be/kGY4t683Xro
Join us at 2pm Boston / 7pm London / 11am Vancouver
Join us at 2pm Boston / 7pm London / 11am Vancouver
December 22, 2025 at 6:26 PM
Why is the universe dominated by Matter? This is the question Fraser and Pamela take on in today's live recording: youtu.be/kGY4t683Xro
Join us at 2pm Boston / 7pm London / 11am Vancouver
Join us at 2pm Boston / 7pm London / 11am Vancouver
In this Live Astronomy Cast episode, Fraser and Pamela take a look at the Hydrogen 21-cm line's out-of-proportion awesomeness.
youtube.com/live/2uvcumU...
youtube.com/live/2uvcumU...
The Hydrogen 21-cm line
YouTube video by Astronomy Cast
youtube.com
December 15, 2025 at 6:51 PM
In this Live Astronomy Cast episode, Fraser and Pamela take a look at the Hydrogen 21-cm line's out-of-proportion awesomeness.
youtube.com/live/2uvcumU...
youtube.com/live/2uvcumU...
Happy #Podcast day, everyone!
It is arguable that humanity now has the technological ability to live on Mars. It would be done at enormous expense & sacrifice, and there are some tricky problems we haven’t solved yet. Although we could live on Mars, should we?
Now out wherever you get podcasts.
It is arguable that humanity now has the technological ability to live on Mars. It would be done at enormous expense & sacrifice, and there are some tricky problems we haven’t solved yet. Although we could live on Mars, should we?
Now out wherever you get podcasts.
November 10, 2025 at 10:30 PM
Happy #Podcast day, everyone!
It is arguable that humanity now has the technological ability to live on Mars. It would be done at enormous expense & sacrifice, and there are some tricky problems we haven’t solved yet. Although we could live on Mars, should we?
Now out wherever you get podcasts.
It is arguable that humanity now has the technological ability to live on Mars. It would be done at enormous expense & sacrifice, and there are some tricky problems we haven’t solved yet. Although we could live on Mars, should we?
Now out wherever you get podcasts.
We're going live on a weird day and at a weird time because Fraser is travelling to UTC+7 while Pamela stays at UTC-6. Come be in the science. Twitch.tv/CosmoQuestX or whatever is live on YouTube.com/@AstronomyCast
November 9, 2025 at 9:33 PM
We're going live on a weird day and at a weird time because Fraser is travelling to UTC+7 while Pamela stays at UTC-6. Come be in the science. Twitch.tv/CosmoQuestX or whatever is live on YouTube.com/@AstronomyCast
Fraser is gearing up to travel, so we're recording RIGHT NOW!!! How many episodes will we record? No idea. What will we record? Many things. This is all @fcain.universetoday.com & @starstryder.space know! Join us on twitch.tv/CosmoQuestX or check out whatever is live on Youtube.com/@AstronomyCast
November 8, 2025 at 9:59 PM
Fraser is gearing up to travel, so we're recording RIGHT NOW!!! How many episodes will we record? No idea. What will we record? Many things. This is all @fcain.universetoday.com & @starstryder.space know! Join us on twitch.tv/CosmoQuestX or check out whatever is live on Youtube.com/@AstronomyCast
ep 770 Records today!
All because we can launch humans toward Mars, should we? @fcain.universetoday.com & @starstryder.space discuss in this live recording at 2pm EDT / 12pm PDT / 7pm GMT.
www.youtube.com/live/14QKJkt...
All because we can launch humans toward Mars, should we? @fcain.universetoday.com & @starstryder.space discuss in this live recording at 2pm EDT / 12pm PDT / 7pm GMT.
www.youtube.com/live/14QKJkt...
November 3, 2025 at 4:33 PM
ep 770 Records today!
All because we can launch humans toward Mars, should we? @fcain.universetoday.com & @starstryder.space discuss in this live recording at 2pm EDT / 12pm PDT / 7pm GMT.
www.youtube.com/live/14QKJkt...
All because we can launch humans toward Mars, should we? @fcain.universetoday.com & @starstryder.space discuss in this live recording at 2pm EDT / 12pm PDT / 7pm GMT.
www.youtube.com/live/14QKJkt...
Happy new podcast day!
@fcain.universetoday.com & @starstryder.space are recording in 2 hours, and our newest edited podcast comes out an hour later!
Join our patreon to get ad-free everything! patreon.com/AstronomyCast
youtube.com/live/Oi72aaD...
@fcain.universetoday.com & @starstryder.space are recording in 2 hours, and our newest edited podcast comes out an hour later!
Join our patreon to get ad-free everything! patreon.com/AstronomyCast
youtube.com/live/Oi72aaD...
Comets' Unpredictability
YouTube video by Astronomy Cast
youtube.com
October 13, 2025 at 3:53 PM
Happy new podcast day!
@fcain.universetoday.com & @starstryder.space are recording in 2 hours, and our newest edited podcast comes out an hour later!
Join our patreon to get ad-free everything! patreon.com/AstronomyCast
youtube.com/live/Oi72aaD...
@fcain.universetoday.com & @starstryder.space are recording in 2 hours, and our newest edited podcast comes out an hour later!
Join our patreon to get ad-free everything! patreon.com/AstronomyCast
youtube.com/live/Oi72aaD...
End-of-Life Planning for Your Spacecraft
YouTube video by Astronomy Cast
youtube.com
October 1, 2025 at 5:06 PM
Info on our server woes. We were dying beneath bots & scrapers, so we turned on free Cloudflare. That helped, but we were still getting hammered by ... China. In the mix of regular reboots, our database decided it was just done (same, really), & wouldn't come back after a force stop.
September 25, 2025 at 12:11 AM
Info on our server woes. We were dying beneath bots & scrapers, so we turned on free Cloudflare. That helped, but we were still getting hammered by ... China. In the mix of regular reboots, our database decided it was just done (same, really), & wouldn't come back after a force stop.
We are back up. Thanks for your patience.
September 24, 2025 at 7:24 PM
We are back up. Thanks for your patience.
Our server has decided it can't even, by which we mean, we can ssh in, but nothing can get out (except the files we just sftp'd. Rebuilding is about to occur.
The server is dead. Long live the server (with a bit of delay).
The server is dead. Long live the server (with a bit of delay).
September 24, 2025 at 5:05 PM
Our server has decided it can't even, by which we mean, we can ssh in, but nothing can get out (except the files we just sftp'd. Rebuilding is about to occur.
The server is dead. Long live the server (with a bit of delay).
The server is dead. Long live the server (with a bit of delay).
Rockets keep effecting the environment in new and weird ways. Find out more in this live recording of Astronomy Cast. We're going live with @fcain.universetoday.com & @starstryder.space in 15min youtube.com/live/2NupNyO...
Rockets v. Environment
YouTube video by Astronomy Cast
youtube.com
September 22, 2025 at 5:43 PM
Rockets keep effecting the environment in new and weird ways. Find out more in this live recording of Astronomy Cast. We're going live with @fcain.universetoday.com & @starstryder.space in 15min youtube.com/live/2NupNyO...
Tomorrow is new podcast day, everyone!
And... if you're a Patreon subscriber at any level, new podcast day came a day early!
Get ready for Episode 764: Cleared for Launch!
And... if you're a Patreon subscriber at any level, new podcast day came a day early!
Get ready for Episode 764: Cleared for Launch!
September 22, 2025 at 3:59 AM
Tomorrow is new podcast day, everyone!
And... if you're a Patreon subscriber at any level, new podcast day came a day early!
Get ready for Episode 764: Cleared for Launch!
And... if you're a Patreon subscriber at any level, new podcast day came a day early!
Get ready for Episode 764: Cleared for Launch!
Although we do wonder (worry?), is it only 3?
During our live recording of @astronomycast.com today, we determined I am actually 3 coffees in a trenchcoat.
I see no lies.
Live, sausage making video, here: youtube.com/live/4GhRypm...
I see no lies.
Live, sausage making video, here: youtube.com/live/4GhRypm...
a close up of a man 's face with the words it 's all true on the bottom
Alt: Harrison Ford as Han Solo in the first sequel movie solemnly saying, "It's all true" in reference to the Jedi.
media.tenor.com
September 19, 2025 at 9:03 PM
Although we do wonder (worry?), is it only 3?
This week's Live Recording is TODAY. No, this isn't normal, but Pamela was eaten by a proposal, and needed cut free Red Ridinghood style. (Not really, but that would be a more interesting story.)
NEW EPISODE: 2pm E / 11am P
www.youtube.com/live/4GhRypm...
NEW EPISODE: 2pm E / 11am P
www.youtube.com/live/4GhRypm...
Cleared for Launch!
YouTube video by Astronomy Cast
www.youtube.com
September 17, 2025 at 4:31 PM
This week's Live Recording is TODAY. No, this isn't normal, but Pamela was eaten by a proposal, and needed cut free Red Ridinghood style. (Not really, but that would be a more interesting story.)
NEW EPISODE: 2pm E / 11am P
www.youtube.com/live/4GhRypm...
NEW EPISODE: 2pm E / 11am P
www.youtube.com/live/4GhRypm...