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PBS Space Time

Space Time explores the outer reaches of space, the craziness of astrophysics, the possibilities of sci-fi, and anything else you can think of beyond Planet Earth with our astrophysicist host: Matthew O’Dowd. For all business inquiries and sponsorship opportunities please reach out to: pbsspacetime@lighthouseagents.com Matt O"Dowd spends his time studying the universe, especially really far-away things like quasars, super-massive black holes, and evolving galaxies. He uses telescopes in space to

science astronomy

All Episodes

17:43

How To Become an Astrophysicist + Challenge Question!

PBS Space Time ·

2026/08/20

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Check out the new Space Time Merch Store! https://pbsspacetime.com/ Support Space Time on Patreon https://www.patreon.com/pbsspacetime Do you want to major in Astrophysics? Are you thinking about becoming (or ever just wondered how one becomes) an Astrophysicists? Do you want to know Matt O’Dowd’s origin story? Then buckle up and enjoy the ride and try your

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19:57

Is Earth's Magnetic Field Reversing?

PBS Space Time ·

2026/08/19

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Please Take the PBS Digital Studios Annual Survey Here: https://www.pbsresearch.org/c/r/ST_YTvideo It's very helpful and you could win a free T-Shirt! Support Space Time on Patreon https://www.patreon.com/pbsspacetime Check out the new Space Time Merch Store! https://pbsspacetime.com/ Earth’s magnetic field protects us from deadly space radiation. What if it

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27:22

Could We Terraform Mars?

PBS Space Time ·

2026/08/18

To discover more go to http://lego.build/CITYSpace PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE Humanity’s future is glorious. As we master space travel, we’ll hop from one lifeless world to the next. Life will blossom in our path and the galaxy with shimmer with beautiful Earth-like orbs. Hmmm… maybe. This won’t sound so far fetched if we prove we can do it at least once. If we successfully terraform Mars. Hosted by Matt

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25:01

Is Pluto a Planet?

PBS Space Time ·

2026/08/18

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Sign up for the mailing list to get episode notifications and hear special announcements! https://mailchi.mp/1a6eb8f2717d/spacetime You know what a planet is, right? A big round thing that orbits a star. Uh, not so fast. The surprisingly vicious debate over the

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25:29

How Many Universes Are There?

PBS Space Time ·

2026/08/17

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Check out the Space Time Merch Store https://pbsspacetime.com/ The universe is big, but it’s peanuts compared to the eternally inflating multiverse. But just how many universes are there? What are they like? And most importantly, what can they tell us about …

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20:03

Black Hole Harmonics

PBS Space Time ·

2026/08/16

Learn more at https://www.brilliant.org/spacetime PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE Black holes are crazy enough on their own – but crash two together and you end up with a roiling blob of inescapable space that vibrates like a beaten drum. And the rich harmonics of those vibrations, seen through gravitational waves, could hold the secrets to the nature of the fabric of spacetime itself. Today on space time journal

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24:17

Loop Quantum Gravity Explained

PBS Space Time ·

2026/08/15

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Check out the Space Time Merch Store https://pbsspacetime.com/ It’s time we talked about loop quantum gravity. What exactly is it? What are the loops? And can it really defeat string theory in our quest for a Theory of Everything? Hosted by Matt O'Dowd Written by

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17:45

Is Time Travel Impossible?

PBS Space Time ·

2026/08/15

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Check out the Space Time Merch Store https://pbsspacetime.com/ Invitation to Time Travelers: https://www.youtube.com/post/UgzeIA0O00-bVioxU4t4AaABCQ Time travel stories are cool because both the past and future are somehow more interesting that the present and because

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21:43

Why We Might Be Alone in the Universe

PBS Space Time ·

2026/08/14

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Check out the Space Time Merch Store https://pbsspacetime.com/ Why does it appear, that humanity is the lone intelligence in the universe? The answer might be that planet Earth is more unique than we've previously assumed. The rare earth hypothesis posits exactly this

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24:08

Does Life Need a Multiverse to Exist?

PBS Space Time ·

2026/08/13

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Check out the Space Time Merch Store https://pbsspacetime.com/ Life exists in our universe. There we go - one hopefully uncontroversial statement. Therefore our universe is capable of producing and supporting life. How am I going? Two for two? Let’s try for three:

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25:13

Can You Observe a Typical Universe?

PBS Space Time ·

2026/08/12

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Check out the Space Time Merch Store https://pbsspacetime.com/ The moment you started observing reality, you hopelessly polluted any conclusions you might make about it. The anthropic principle guarantees that you are NOT seeing the universe in most typical state. But

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23:23

Is The Universe Finite?

PBS Space Time ·

2026/08/12

Thanks to Brilliant for supporting PBS. Learn more at: https://www.brilliant.org/spacetime PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE The universe is big, really, really big. Although according to a new paper, it may literally be infinitely smaller than we previously thought. Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Check out the Space Time Merch

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24:34

The Doomsday Argument

PBS Space Time ·

2026/08/11

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Sign up for the mailing list to get episode notifications and hear special announcements! https://mailchi.mp/1a6eb8f2717d/spacetime Check out the Space Time Merch Store https://pbsspacetime.com/ Since the dawn of humanity around 100 billion people have lived. How many

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25:14

Do Black Holes Create New Universes?

PBS Space Time ·

2026/08/10

Thanks to Brilliant for supporting PBS. Learn more at: https://brilliant.org/spacetime PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE What if every single black hole that formed in our universe sparked the big bang of a new universe? Cosmological natural selection proposes exactly this - but even better, it claims to be able to test the hypothesis. Sign Up on Patreon to get access to the Space Time Discord

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13:50

How To Detect a Neutrino

PBS Space Time ·

2026/08/10

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Explore the Fermilab YT Channel here: https://www.youtube.com/user/fermilab Why is there something rather than nothing? Well the answer may be found in the weakest particle in the universe: the neutrino. For over half a century Fermilab has been the premier particle accelerator facility of the United States and we got to visit with Don Lincoln to explore it’s

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20:42

How To Capture Black Holes

PBS Space Time ·

2026/08/09

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Check out the Space Time Merch Store https://pbsspacetime.com/ Sign Up for the Space Time Mailing List https://tinyurl.com/yx9cusk5 Black holes are awesome - but how about black holes being captured by the screaming vortex of a quasar, where they merge and grow like

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22:02

Solving the Three Body Problem

PBS Space Time ·

2026/08/08

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE↓ More info below ↓ Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Sign up for the mailing list to get episode notifications and hear special announcements! https://tinyurl.com/yx9cusk5 Check out the Space Time Merch Store https://pbsspacetime.com/ The three body problem is famous for being impossible to solve. But actually it's been

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23:37

Hacking the Nature of Reality

PBS Space Time ·

2026/08/07

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Sign up for the mailing list to get episode notifications and hear special announcements! https://tinyurl.com/yx9cusk5 Check out the Space Time Merch Store https://pbsspacetime.com/ In particle physics we try to understand reality by looking for smaller and smaller

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23:40

Are there Infinite Versions of You?

PBS Space Time ·

2026/08/07

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Sign up for the mailing list to get episode notifications and hear special announcements! https://tinyurl.com/yx9cusk5 Check out the Space Time Merch Store https://pbsspacetime.com/ If the universe goes on forever, does that mean there are infinite versions of you out

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23:45

Are Axions Dark Matter?

PBS Space Time ·

2026/08/06

For more information go to: https://nordvpn.com/spacetime and use the code: spacetimePBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Check out the Space Time Merch Store https://pbsspacetime.com/ Sign Up for the Space Time Mailing List: https://tinyurl.com/yx9cusk5 What does the strong nuclear force, the fundamental symmetries of

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