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    Astronomy

    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 do it. Matt completed his Ph.D. at NASA’s Space Telescope Science Institute, followed by work at the University of Melbourne and Columbia University. He’s now a professor at the City University of New York’s Lehman College and an Associate at the American Museum of Natural History’s Hayden Planetarium.

    Previous host Gabe Perez-Giz is an astrophysicist who studies black hole physics. He received his Ph.D. from Columbia University and also hosted PBS Infinite Series.

    patreon.com/pbsspacetime

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    Latest Episodes:
    Neutron Stars Collide in New LIGO Signal? Oct 21, 2026
    Show notes

    Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/DonateSPACE
    Uploaded 13-09-17
    LIGO may have just detected gravitational waves from the collision of two Neutron Stars. And go to http://curiositystream.com/spacetime
    for two months of free Curiosity Stream. Use the promo code "spacetime" during the sign-up process.
    You can further support us on Patreon at https://www.patreon.com/pbsspacetime
    Get your own Space Time t­shirt at http://bit.ly/1QlzoBi
    Tweet at us! @pbsspacetime
    Facebook: facebook.com/pbsspacetime
    Email us! pbsspacetime [at] gmail [dot] com
    Comment on Reddit: http://www.reddit.com/r/pbsspacetime
    Help translate our videos! https://www.youtube.com/timedtext_cs_...
    Previous Episode:
    https://www.youtube.com/watch?time_continue=1&v=S4aqGI1mSqo
    Links to the videos mentioned:
    https://www.youtube.com/watch?v=gw-i_VKd6Wo
    https://www.youtube.com/watch?v=1Tstyqz2g7o
    https://www.youtube.com/watch?v=eJ2RNBAFLj0
    https://www.youtube.com/watch?v=xx4562gesw0&t=71
    Last year LIGO announced the detection of gravitational waves from the merger of two black holes. The science world went a little crazy. Only a few weeks ago a new rumour emerged: that LIGO had, for the first time, spotted gravitational waves from the collision of a pair of neutron stars. If it’s true, some long-standing astrophysical mysteries are about to be unlocked.
    Written and Hosted by Matt O’Dowd
    Produced by Rusty Ward
    Graphics by Kurt Ross
    Assistant Editing and Sound Design by Mike Petrow
    Made by Kornhaber Brown (www.kornhaberbrown.com)
    Special thanks to our Patreon Big Bang, Quasar and Hypernova Supporters:
    Big Bang
    CoolAsCats
    David Nicklas
    Richard Senegor
    Quasar
    Tambe Barsbay
    Max Levine
    Mayank M. Mehrota
    Mars Yentur
    Mark Rosenthal
    Dean Fuqua
    Hypernova
    Edmund Fokschaner
    Max Levine
    Eugene Lawson
    Chuck Zegar
    Jordan Young
    Ratfeast
    John Hofmann
    Joseph Salomone
    Martha Hunt
    Craig Peterson
    Barry Hatfield
    Matthew O’Connor
    Thanks to our Patreon Gamma Ray Burst Supporters:
    Scott Gossett
    Mark Dykstra
    Peter Durocher
    Michael Kers
    Chris Hicks
    Mark Vasile
    Patrick Murray
    Sultan Alkhulaifi
    Alex Seto
    Jared Moore
    Michal-Peanut Karmi
    Bernardo Higuera
    Erik Stein
    Daniel Lyons
    Kevin Warne
    JJ Bagnell
    J Rejc
    Amy Jie
    Avi Goldfinger
    John Pettit
    Shannan Catalano
    Florian Stinglmayr
    Yubo Du
    Benoit Pagé-Guitard
    Nathan Leniz
    Jessica Fraley
    Loro Lukic
    Brandon Labonte
    David Crane
    Greg Weiss
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    The Future of Space Telescopes Oct 20, 2026
    Show notes

    Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/DonateSPACE
    Uploaded 20-09-17
    The mysteries of our universe seem limitless. However to unlock them, we’re going to need some incredible technologies to peer deeper and more sharply into space time.
    You can further support us on Patreon at https://www.patreon.com/pbsspacetime
    Get your own Space Time t­shirt at http://bit.ly/1QlzoBi
    Tweet at us! @pbsspacetime
    Facebook: facebook.com/pbsspacetime
    Email us! pbsspacetime [at] gmail [dot] com
    Comment on Reddit: http://www.reddit.com/r/pbsspacetime
    Help translate our videos! https://www.youtube.com/timedtext_cs_...
    Previous Episode:
    https://www.youtube.com/watch?v=kL81uuYW9BY&t=40s
    The Kepler mission has determined that terrestrial planets - that is, rocky planets like our Earth are extremely common, and may orbit most stars in the Milky Way. But these planets are extremely difficult to directly image because they’re dense and small. Our Sun is about ten billion times brighter than Earth. Train a distant telescope on us, and it will be overwhelmed by the Sun’s rays. So how can we find terrestrial planets around stars light years away?
    Written by Alex Yep and Matt O’Dowd
    Hosted by Matt O’Dowd
    Produced by Rusty Ward
    Graphics by Kurt Ross
    Assistant Editing and Sound Design by Mike Petrow
    Made by Kornhaber Brown (www.kornhaberbrown.com)
    Special thanks to our Patreon Big Bang, Quasar and Hypernova Supporters:
    Big Bang
    BITISM
    CoolAsCats
    David Nicklas
    Richard Senegor
    Quasar
    Tambe Barsbay
    Meo Meow Oink Oink
    Mayank M. Mehrota
    Mars Yentur
    Mark Rosenthal
    Dean Fuqua
    Hypernova
    Max Levine
    Edmund Fokschaner
    Eugene Lawson
    Chuck Zegar
    Jordan Young
    Ratfeast
    John Hofmann
    Joseph Salomone
    Martha Hunt
    Craig Peterson
    Barry Hatfield
    Matthew O’Connor
    Thanks to our Patreon Gamma Ray Burst Supporters:
    Scott Gossett
    Mark Dykstra
    Peter Durocher
    Michael Kers
    Chris Hicks
    Mark Vasile
    Patrick Murray
    Sultan Alkhulaifi
    Alex Seto
    Michal-Peanut Karmi
    Bernardo Higuera
    Erik Stein
    Daniel Lyons
    Kevin Warne
    JJ Bagnell
    J Rejc
    Amy Jie
    Avi Goldfinger
    John Pettit
    Shannan Catalano
    Florian Stinglmayr
    Yubo Du
    Benoit Pagé-Guitard
    Nathan Leniz
    Jessica Fraley
    Loro Lukic
    Brandon Labonte
    David Crane
    Greg Weiss
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    Are the Fundamental Constants Changing? Oct 19, 2026
    Show notes

    Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/DonateSPACE
    Uploaded 28-09-17
    Recent findings suggest that the fundamental constants might not be as stable as we assumed. And be sure to signup for your free trial of The Great Courses Plus at http://ow.ly/rcsA30beNw1
    You can further support us on Patreon at https://www.patreon.com/pbsspacetime
    Get your own Space Time t­shirt at http://bit.ly/1QlzoBi
    Tweet at us! @pbsspacetime
    Facebook: facebook.com/pbsspacetime
    Email us! pbsspacetime [at] gmail [dot] com
    Comment on Reddit: http://www.reddit.com/r/pbsspacetime
    Help translate our videos! https://www.youtube.com/timedtext_cs_...
    Previous Episode:
    The Future of Space Telescopes
    https://www.youtube.com/watch?v=kL81uuYW9BY&t=40s
    Webb et al. 1998, A Search for Time Variation of the Fine Structure Constant
    https://arxiv.org/abs/astro-ph/9803165
    Webb et al. 2011, A Search for Time Variation of the Fine Structure Constant
    https://arxiv.org/abs/1008.3907
    Martins and Pinho 2016, Stability of Fundamental Couplings: a Global Analysis
    https://arxiv.org/abs/1701.08724
    The laws of physics are the same everywhere in the universe. At least we astrophysicists hope so. After all, it’s hard to unravel the complexities of distant parts of the universe if we don’t know the basic rules. But what if this is wrong? There is a hint of evidence that the fundamental constants that govern our universe may evolve over time, and even from one location to another.
    Written by Graeme Gossel and Matt O’Dowd
    Hosted by Matt O'Dowd
    Produced by Rusty Ward
    Graphics by Kurt Ross
    Assistant Editing and Sound Design by Mike Petrow
    Made by Kornhaber Brown (www.kornhaberbrown.com)
    Special thanks to our Patreon Big Bang, Quasar and Hypernova Supporters:
    Big Bang
    BITISM
    CoolAsCats
    David Nicklas
    Richard Senegor
    Quasar
    Tambe Barsbay
    Meo Meow Oink Oink
    Mayank M. Mehrota
    Mars Yentur
    Mark Rosenthal
    Dean Fuqua
    Hypernova
    Max Levine
    Edmund Fokschaner
    Eugene Lawson
    Chuck Zegar
    Jordan Young
    Ratfeast
    John Hofmann
    Joseph Salomone
    Martha Hunt
    Craig Peterson
    Barry Hatfield
    Matthew O’Connor
    Thanks to our Patreon Gamma Ray Burst Supporters:
    Scott Gossett
    Mark Dykstra
    Peter Durocher
    Michael Kers
    Chris Hicks
    Mark Vasile
    Patrick Murray
    Sultan Alkhulaifi
    Alex Seto
    Michal-Peanut Karmi
    Bernardo Higuera
    Erik Stein
    Daniel Lyons
    Kevin Warne
    JJ Bagnell
    J Rejc
    Amy Jie
    Avi Goldfinger
    John Pettit
    Shannan Catalano
    Florian Stinglmayr
    Yubo Du
    Benoit Pagé-Guitard
    Nathan Leniz
    Jessica Fraley
    Loro Lukic
    Brandon Labonte
    David Crane
    Greg Weiss
    The Great Courses Plus is currently available to watch through a web browser to almost anyone in the world and optimized for the US market. The Great Courses Plus is currently working to both optimize the product globally and accept credit card payments globally.
    Learn more about your ad choices. Visit megaphone.fm/adchoices

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    When Quasars Collide STJC Oct 19, 2026
    Show notes

    Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/DonateSPACE
    Uploaded 04-10-17
    So what happens when two Super Massive Black Holes collide? We may be about to find out, because astronomers have spotted a pair of them in a close binary orbit for the very first time.
    This episode of Space Time Journal Club discusses:
    "A candidate sub-parsec binary black hole in the Seyfert galaxy NGC 7674", Kharb, Lal and Merritt 2017
    https://arxiv.org/abs/1709.06258
    You can further support us on Patreon at https://www.patreon.com/pbsspacetime
    Get your own Space Time t­shirt at http://bit.ly/1QlzoBi
    Tweet at us! @pbsspacetime
    Facebook: facebook.com/pbsspacetime
    Email us! pbsspacetime [at] gmail [dot] com
    Comment on Reddit: http://www.reddit.com/r/pbsspacetime
    Help translate our videos! https://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g
    Previous Episode:
    Are the Fundamental Constants changing?
    https://www.youtube.com/watch?v=YJzoelANL_Y&t=8s
    Related Episodes:
    How to Build a Black Hole
    https://www.youtube.com/watch?v=xx4562gesw0
    Why Quasars are so Awesome
    https://www.youtube.com/watch?v=3TZEp_n3eIc
    Links to Comments Response:
    Nevermind
    https://www.youtube.com/watch?v=YJzoelANL_Y&lc=z223hpipuozhh1qbj04t1aokgn5pfpqlq0zgbnrilm5obk0h00410
    Lutra Nereis
    https://www.youtube.com/watch?v=YJzoelANL_Y&lc=z22cwtzjvv3ojx0ucacdp430ixcyhmpsu1ahlosnyedw03c010c
    Arnaldo Castro
    https://www.youtube.com/watch?v=YJzoelANL_Y&lc=z22txnyo1lnwh1j03acdp430bunzm5m4x3xf5jwx0xxw03c010c
    0xFFF1
    https://www.youtube.com/watch?v=YJzoelANL_Y&lc=z23sjnwjrwnljxe3macdp434i1lxdqjdsvf2ovd3r41w03c010c
    WispXLegend
    https://www.youtube.com/watch?v=YJzoelANL_Y&lc=z22rivtz4oz2db4kmacdp431v2mactt0223icalvag1w03c010c
    Rubbergnome
    https://www.youtube.com/watch?v=YJzoelANL_Y&lc=z22phdvhwsyehtjxe04t1aokg3gkri0vdluvsttfuju0bk0h00410
    In this video, we discuss the reports about the detection of a pair of supermassive black holes orbiting only one light year apart from each other. Studying the dance of these giants should tell us a ton about how black holes grow. This paper was just published in Nature Astronomy by Preeti Kharb and Dharam Vir Lal from India’s National Center for Radio Astrophysics, and David Merritt from the Rochester Institute of Technology.
    Written and Hosted by Matt O'Dowd
    Produced by Rusty Ward
    Graphics by Kurt Ross
    Assistant Editing and Sound Design by Mike Petrow
    Made by Kornhaber Brown (www.kornhaberbrown.com)
    Special thanks to our Patreon Big Bang, Quasar and Hypernova Supporters:
    Big Bang
    BITISM
    CoolAsCats
    David Nicklas
    Richard Senegor
    Quasar
    Tambe Barsbay
    Mayank M. Mehrota
    Mars Yentur
    Mark Rosenthal
    Dean Fuqua
    Y2
    Justin Lloyd
    Hypernova
    Edmund Fokschaner
    Max Levine
    Matthew O’Connor
    Eugene Lawson
    Barry Hatfield
    Martha Hunt
    Joseph Salomone
    Chuck Zegar
    Craig Peterson
    Jordan Young
    Ratfeast
    John Hofmann
    Thanks to our Patreon Gamma Ray Burst Supporters:
    Nick Virtue
    Alexey Eromenko
    Nicholas Rose
    Scott Gossett
    Mark Dykstra
    Peter Durocher
    Michael Kers
    Chris Hicks
    Mark Vasile
    Patrick Murray
    Sultan Alkhulaifi
    Alex Seto
    Michal-Peanut Karmi
    Erik Stein
    Daniel Lyons
    Kevin Warne
    JJ Bagnell
    J Rejc
    Amy Jie
    Avi Goldfinger
    John Pettit
    Shannan Catalano
    Florian Stinglmayr
    Yubo Du
    Benoit Pagé-Guitard
    Nathan Leniz
    Jessica Fraley
    Loro Lukic
    Brandon Labonte
    David Crane
    Greg Weiss
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    Absolute Cold | Space Time Oct 18, 2026
    Show notes

    Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/DonateSPACE
    Uploaded 11-10-17
    Can we ever achieve absolute cold? Try CuriosityStream today: http://curiositystream.com/spacetime
    You can further support us on Patreon at https://www.patreon.com/pbsspacetime
    Get your own Space Time t­shirt at http://bit.ly/1QlzoBi
    Tweet at us! @pbsspacetime
    Facebook: facebook.com/pbsspacetime
    Email us! pbsspacetime [at] gmail [dot] com
    Comment on Reddit: http://www.reddit.com/r/pbsspacetime
    Help translate our videos!
    https://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g
    Previous Episode:
    When Quasars Collide STJC | Space Time
    https://www.youtube.com/watch?v=gtZ7OVoI2nc
    Resources:
    Absolute Zero:
    https://en.wikipedia.org/wiki/Absolute_zero
    Zero-Point Energy:
    https://en.wikipedia.org/wiki/Zero-point_energy
    Bose-Einstein Condensate:
    https://en.wikipedia.org/wiki/Bose-Einstein_condensate
    Alfred Leitner's Superfluid Liquid Helium:
    http://alfredleitner.com/superfluid.html
    Links to Comments Response:
    Rcoates89
    https://www.youtube.com/watch?v=gtZ7OVoI2nc&lc=z22lcfrgpz2sg5ixd04t1aokgcrarmubr2l25rvpe2erbk0h00410
    Joseph Gamble
    https://www.youtube.com/watch?v=gtZ7OVoI2nc&lc=z23xwxyhhnaiupzpm04t1aokgrzsld44qfcv4gwseddzbk0h00410
    Dillan Burris
    https://www.youtube.com/watch?v=gtZ7OVoI2nc&lc=z22vflpxcoaajd0f3acdp435lhovrxjuxvfyg4vdjsxw03c010c
    Rubbergnome
    https://www.youtube.com/watch?v=gtZ7OVoI2nc&lc=z22phdvhwsyehtjxe04t1aokg1ewo1qi3ouyue3ocjgnbk0h00410
    Many experimental physicists have spent their careers trying to cool things to absolute zero. This state of absolute cold is the zero-point on the Kelvin temperature scale, corresponding to -273.15 Celsius. Using lasers and magnetic fields, we’ve now managed to cool certain substances to less than a billionth of a Kelvin. Doing so has revealed some bizarre quantum states of matter. But quantum mechanics may also prevent us from ever reaching absolute zero. Understanding the limit to cold will lead us to an understanding of the nature of the quantum vacuum itself.
    Written and Hosted by Matt O'Dowd
    Produced by Rusty Ward
    Graphics by Kurt Ross
    Assistant Editing and Sound Design by Mike Petrow
    Made by Kornhaber Brown (www.kornhaberbrown.com)
    Special thanks to our Patreon Big Bang, Quasar and Hypernova Supporters:
    Big Bang
    BITISM
    CoolAsCats
    David Nicklas
    Richard Senegor
    Quasar
    Tambe Barsbay
    Mayank M. Mehrota
    Mars Yentur
    Mark Rosenthal
    Dean Fuqua
    Y2
    Justin Lloyd
    Hypernova
    Edmund Fokschaner
    Max Levine
    Matthew O’Connor
    Eugene Lawson
    Barry Hatfield
    Martha Hunt
    Joseph Salomone
    Chuck Zegar
    Craig Peterson
    Jordan Young
    Ratfeast
    John Hofmann
    Thanks to our Patreon Gamma Ray Burst Supporters:
    Denys Ivanov
    Nick Virtue
    Alexey Eromenko
    Nicholas Rose
    Scott Gossett
    Mark Dykstra
    Peter Durocher
    Michael Kers
    Chris Hicks
    Mark Vasile
    Patrick Murray
    Sultan Alkhulaifi
    Alex Seto
    Michal-Peanut Karmi
    Erik Stein
    Daniel Lyons
    Kevin Warne
    JJ Bagnell
    J Rejc
    Amy Jie
    Avi Goldfinger
    John Pettit
    Shannan Catalano
    Florian Stinglmayr
    Yubo Du
    Benoit Pagé-Guitard
    Nathan Leniz
    Jessica Fraley
    Loro Lukic
    Brandon Labonte
    David Crane
    Greg Weiss
    Learn more about your ad choices. Visit megaphone.fm/adchoices

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    The Nature of Nothing | Space Time Oct 17, 2026
    Show notes

    Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/DonateSPACE
    Uploaded 19-10-17
    It turns out that "nothing" is one of the most interesting somethings in all of physics. Signup for your free trial to The Great Courses Plus here: http://ow.ly/OOOp30beNyt
    Note: There is a correction in this video that has been addressed in the pinned comment below.
    You can further support us on Patreon at https://www.patreon.com/pbsspacetime
    Get your own Space Time t­shirt at http://bit.ly/1QlzoBi
    Tweet at us! @pbsspacetime
    Facebook: facebook.com/pbsspacetime
    Email us! pbsspacetime [at] gmail [dot] com
    Comment on Reddit: http://www.reddit.com/r/pbsspacetime
    Help translate our videos!
    https://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g
    Previous Episode:
    Absolute Cold | Space Time
    https://www.youtube.com/watch?v=OvgZqGxF3eo
    Links to Comments Response:
    Man from Nantucket
    https://www.youtube.com/watch?v=OvgZqGxF3eo&lc=z22au3kgsnywi3tfuacdp43bey3x42yghxxfro3of3dw03c010c
    Laxmi Papney
    https://www.youtube.com/watch?v=OvgZqGxF3eo&lc=z221wb4gbmqozpfih04t1aokghgvqbdfhp5uaokihurork0h00410
    Flo Striker
    https://www.youtube.com/watch?v=OvgZqGxF3eo&lc=z22exnpronzrfh4ij04t1aokgvbvlfrzle5r0scv5yx4bk0h00410
    HK Norman
    https://www.youtube.com/watch?v=OvgZqGxF3eo&lc=z22gsnaxxkr4ht0vuacdp43b2kufaeojpztkpo35ecpw03c010c
    thesimulacre
    https://www.youtube.com/watch?v=OvgZqGxF3eo&lc=z22mxzsqdkyhuvkdkacdp433mitjuajhidaq0f5avexw03c010c
    How do we study nothing? An empty jar still contains something: molecules of air and a bath of infrared light from its warm environment. But what if we suck out every last molecule of air, chill the jar to absolute zero, and shield it from all external radiation? The jar would contain only empty space, but it turns out that empty space is far from nothing.
    Written and Hosted by Matt O'Dowd
    Produced by Rusty Ward
    Graphics by Kurt Ross
    Assistant Editing and Sound Design by Mike Petrow
    Made by Kornhaber Brown (www.kornhaberbrown.com)
    Special thanks to our Patreon Big Bang, Quasar and Hypernova Supporters:
    Big Bang
    BITISM
    CoolAsCats
    David Nicklas
    Richard Senegor
    Quasar
    Tambe Barsbay
    Mayank M. Mehrota
    Mars Yentur
    Mark Rosenthal
    Dean Fuqua
    Y2
    Justin Lloyd
    Hypernova
    Edmund Fokschaner
    Max Levine
    Matthew O’Connor
    Eugene Lawson
    Barry Hatfield
    Martha Hunt
    Joseph Salomone
    Chuck Zegar
    Craig Peterson
    Jordan Young
    Ratfeast
    John Hofmann
    Thanks to our Patreon Gamma Ray Burst Supporters:
    Denys Ivanov
    Nick Virtue
    Alexey Eromenko
    Nicholas Rose
    Scott Gossett
    Mark Dykstra
    Peter Durocher
    Michael Kers
    Chris Hicks
    Mark Vasile
    Patrick Murray
    Sultan Alkhulaifi
    Alex Seto
    Michal-Peanut Karmi
    Erik Stein
    Daniel Lyons
    Kevin Warne
    JJ Bagnell
    J Rejc
    Amy Jie
    Avi Goldfinger
    John Pettit
    Shannan Catalano
    Florian Stinglmayr
    Yubo Du
    Benoit Pagé-Guitard
    Nathan Leniz
    Jessica Fraley
    Loro Lukic
    Brandon Labonte
    David Crane
    Greg Weiss
    The Great Courses Plus is currently available to watch through a web browser to almost anyone in the world and optimized for the US market. The Great Courses Plus is currently working to both optimize the product globally and accept credit card payments globally.
    Learn more about your ad choices. Visit megaphone.fm/adchoices

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    The Missing Mass Mystery Oct 16, 2026
    Show notes

    Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/DonateSPACE
    Uploaded 25-10-17
    For years, astronomers have been unable to find up to half of the baryonic matter in the universe. We may just have solved this problem.
    You can further support us on Patreon at https://www.patreon.com/pbsspacetime
    Get your own Space Time t­shirt at http://bit.ly/1QlzoBi
    Tweet at us! @pbsspacetime
    Facebook: facebook.com/pbsspacetime
    Email us! pbsspacetime [at] gmail [dot] com
    Comment on Reddit: http://www.reddit.com/r/pbsspacetime
    Help translate our videos!
    https://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g
    Previous Episode:
    The Nature of Nothing | Space Time
    https://www.youtube.com/watch?v=X5rAGfjPSWE&t=55s
    Dark Matter!
    https://youtu.be/z3rgl-_a5C0
    Dark Energy Playlist
    https://youtu.be/xZTb6sfHEX8?list=PLsPUh22kYmNA6WUmOsEEi32zi_RdSUF4i
    We’ve known for some time that around 95% of the energy content of the universe is in dark matter and dark energy. This dark sector doesn’t interact with light in any way and so is invisible to us. The remaining 5% - the light sector – represents all of the regular matter in the universe. Yet what if I told you that all of the stars and galaxies and galaxy clusters only comprise 10% of the light sector. The rest has proved as elusive as the dark sector. We think it must exist as extremely diffuse gas in between the galaxies, yet our intense searches miss up to half of it. At least until now.
    Resources
    Graaff et al. 2017, "Missing Baryons in the Cosmic Web Revealed by the Sunyaev-Zel'dovich Effect"
    https://arxiv.org/abs/1709.10378v1
    Tanimura et al. 2017, "A Search for Warm/Hot Gas Filaments Between Pairs of SDSS Luminous Red Galaxies"
    https://arxiv.org/abs/1709.05024
    Written and Hosted by Matt O'Dowd
    Produced by Rusty Ward
    Graphics by Kurt Ross
    Assistant Editing and Sound Design by Mike Petrow
    Made by Kornhaber Brown (www.kornhaberbrown.com)
    Special thanks to our Patreon Big Bang, Quasar and Hypernova Supporters:
    Big Bang
    BITISM
    CoolAsCats
    David Nicklas
    Richard Senegor
    Quasar
    Tambe Barsbay
    Mayank M. Mehrota
    Mars Yentur
    Mark Rosenthal
    Dean Fuqua
    Y2
    Justin Lloyd
    Hypernova
    Edmund Fokschaner
    Max Levine
    Matthew O’Connor
    Eugene Lawson
    Barry Hatfield
    Martha Hunt
    Joseph Salomone
    Chuck Zegar
    Craig Peterson
    Jordan Young
    Ratfeast
    John Hofmann
    Thanks to our Patreon Gamma Ray Burst Supporters:
    Denys Ivanov
    Nick Virtue
    Alexey Eromenko
    Nicholas Rose
    Scott Gossett
    Mark Dykstra
    Peter Durocher
    Michael Kers
    Chris Hicks
    Mark Vasile
    Patrick Murray
    Sultan Alkhulaifi
    Alex Seto
    Michal-Peanut Karmi
    Erik Stein
    Daniel Lyons
    Kevin Warne
    JJ Bagnell
    J Rejc
    Amy Jie
    Avi Goldfinger
    John Pettit
    Shannan Catalano
    Florian Stinglmayr
    Yubo Du
    Benoit Pagé-Guitard
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    Jessica Fraley
    Loro Lukic
    Brandon Labonte
    David Crane
    Greg Weiss
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    The Vacuum Catastrophe Oct 16, 2026
    Show notes

    Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/DonateSPACE
    Uploaded 02-11-17
    If vacuum energy really does have the enormous value predicted by quantum field theory then our gently expanding, geometrically flat universe shouldn’t exist. This is the vacuum catastrophe.
    You can further support us on Patreon at https://www.patreon.com/pbsspacetime
    Get your own Space Time t­shirt at http://bit.ly/1QlzoBi
    Tweet at us! @pbsspacetime
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    Help translate our videos!
    https://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g
    Previous Episode:
    The Missing Mask Mystery | Space Time
    https://www.youtube.com/watch?v=RchRrngfjQY
    Links to Comments Response:
    Michael
    https://www.youtube.com/watch?v=X5rAGfjPSWE&lc=z23swryzgkibc3atqacdp43a31ukx3xnflbaomxcwwlw03c010c
    Jeremy Zambelli
    https://www.youtube.com/watch?v=X5rAGfjPSWE&lc=z23dhh04rtmeez1rb04t1aokgicw4o1gjiic2vmezi2fbk0h00410
    TS1336
    https://www.youtube.com/watch?v=X5rAGfjPSWE&lc=z22sux052luoih4xz04t1aokgu2halbv0cnkiqu4azyerk0h00410
    Eliran Cohen
    https://www.youtube.com/watch?v=X5rAGfjPSWE&lc=z22yzr5z3u3yvn2hs04t1aokgnid302xmdruho1qwzylbk0h00410
    Let’s talk about vacuum energy from a theoretical standpoint. From the perspective of quantum field theory, every point in space is represented by a quantum oscillator; one for each elementary particle type. Higher energy oscillations represent the presence of real particles. However even the lowest possible energy oscillation – the one corresponding to the absence of particles – has some energy.
    Written and Hosted by Matt O'Dowd
    Produced by Rusty Ward
    Graphics by Kurt Ross
    Assistant Editing and Sound Design by Mike Petrow
    Made by Kornhaber Brown (www.kornhaberbrown.com)
    Special thanks to our Patreon Big Bang, Quasar and Hypernova Supporters:
    Big Bang
    BITISM
    CoolAsCats
    David Nicklas
    Quasar
    Tambe Barsbay
    Mayank M. Mehrota
    Mars Yentur
    Mark Rosenthal
    Dean Fuqua
    Y2
    Justin Lloyd
    Hypernova
    Edmund Fokschaner
    Max Levine
    Matthew O’Connor
    Eugene Lawson
    Barry Hatfield
    Martha Hunt
    Joseph Salomone
    Chuck Zegar
    Craig Peterson
    Jordan Young
    Ratfeast
    John Hofmann
    Thanks to our Patreon Gamma Ray Burst Supporters:
    Denys Ivanov
    Nick Virtue
    Alexey Eromenko
    Nicholas Rose
    Scott Gossett
    Mark Dykstra
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    Alex Seto
    Michal-Peanut Karmi
    Erik Stein
    Daniel Lyons
    Kevin Warne
    JJ Bagnell
    J Rejc
    Amy Jie
    Avi Goldfinger
    John Pettit
    Shannan Catalano
    Florian Stiglmayr
    Yubo Du
    Benoit Pagé-Guitard
    Nathan Leniz
    Jessica Fraley
    Loro Lukic
    Brandon Labonte
    David Crane
    Greg Weiss
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    Zero-Point Energy Demystified Oct 15, 2026
    Show notes

    Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/DonateSPACE
    Uploaded 08-11-17
    Let’s talk about the mysterious zero-point energy and what it really can, and really can’t do.
    You can further support us on Patreon at https://www.patreon.com/pbsspacetime
    Get your own Space Time t­shirt at http://bit.ly/1QlzoBi
    Tweet at us! @pbsspacetime
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    Help translate our videos!
    https://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g
    Previous Episode:
    The Vacuum Challenge | Space Time
    https://www.youtube.com/watch?v=n6jAOV7bZ3Y
    The quantum field theory predicts that there exists an energy of the vacuum resulting from the non-zero zero-point energies of the quantum fields that fill our universe. As we discussed in our last episode on the vacuum catastrophe, this mismatch between the measured and theoretical values of vacuum energy is one of the greatest unsolved problems in physics.
    Written and Hosted by Matt O'Dowd
    Produced by Rusty Ward
    Graphics by Kurt Ross
    Assistant Editing and Sound Design by Mike Petrow
    Made by Kornhaber Brown (www.kornhaberbrown.com)
    Special thanks to our Patreon Big Bang, Quasar and Hypernova Supporters:
    Big Bang
    BITISM
    CoolAsCats
    David Nicklas
    Quasar
    Tambe Barsbay
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    Mars Yentur
    Mark Rosenthal
    Dean Fuqua
    Y2
    Justin Lloyd
    Hypernova
    Edmund Fokschaner
    Max Levine
    Matthew O’Connor
    Eugene Lawson
    Barry Hatfield
    Martha Hunt
    Joseph Salomone
    Chuck Zegar
    Craig Peterson
    Jordan Young
    Ratfeast
    John Hofmann
    Thanks to our Patreon Gamma Ray Burst Supporters:
    Denys Ivanov
    Nick Virtue
    Alexey Eromenko
    Nicholas Rose
    Scott Gossett
    Mark Dykstra
    Chris Hicks
    Mark Vasile
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    Sultan Alkhulaifi
    Alex Seto
    Michal-Peanut Karmi
    Erik Stein
    Daniel Lyons
    Kevin Warne
    JJ Bagnell
    J Rejc
    Amy Jie
    Avi Goldfinger
    John Pettit
    Shannan Catalano
    Florian Stiglmayr
    Yubo Du
    Benoit Pagé-Guitard
    Nathan Leniz
    Jessica Fraley
    Loro Lukic
    Brandon Labonte
    David Crane
    Greg Weiss
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    Suicide Space Robots Oct 14, 2026
    Show notes

    Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/DonateSPACE
    Uploaded 22-11-17
    Let’s take a moment to remember the selfless sacrifices made by some amazing robotic explorers. And be sure to learn more about your personal DNA story by going to https://www.23andMe.com/spacetime and taking advantage of their special holiday offer.
    You can further support us on Patreon at https://www.patreon.com/pbsspacetime
    Get your own Space Time t­shirt at http://bit.ly/1QlzoBi
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    Facebook: facebook.com/pbsspacetime
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    Help translate our videos!
    https://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g
    Previous Episode:
    Zero-Point Energy Demystified | Space Time
    https://www.youtube.com/watch?v=Rh898Yr5YZ8
    It takes a lot of tech to send humans into space and to keep people alive up there, and get them safely home. But we have few qualms about sending robots on one-way suicide missions to the stars. And in some cases, the very destruction of these probes is part of the scientific experiment. Or in the case of the recent destruction of Cassini, to protect the solar system for future experiments. Today we’re going to memorialize the robots that have given their lives for in the name of space exploration.
    Hosted by Matt O'Dowd
    Written by Drew Rosen and Matt O'Dowd
    Produced by Rusty Ward
    Graphics by Kurt Ross
    Assistant Editing and Sound Design by Mike Petrow
    Made by Kornhaber Brown (www.kornhaberbrown.com)
    Special thanks to our Patreon Big Bang, Quasar and Hypernova Supporters:
    Big Bang
    BITISM
    CoolAsCats
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    Y2
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    Max Levine
    Matthew O’Connor
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    Chuck Zegar
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    Jordan Young
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    John Hofmann
    Thanks to our Patreon Gamma Ray Burst Supporters:
    Mechanically Cryptic
    Denys Ivanov
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    Mark Dykstra
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    Sultan Alkhulaifi
    Alex Seto
    Michal-Peanut Karmi
    Erik Stein
    Daniel Lyons
    Kevin Warne
    JJ Bagnell
    J Rejc
    Amy Jie
    Avi Goldfinger
    John Pettit
    Shannan Catalano
    Florian Stiglmayr
    Yubo Du
    Benoit Pagé-Guitard
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