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The Black Hole Detection Project That Just Got Defunded, with Kelly Holley-Bockelmann

2025-09-23 Science & Technology
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LISA: Opening a New Window to Gravitational Wave Astronomy

Discover how the space-based LISA mission will hunt for supermassive black hole mergers and even the gravitational echo of the Big Bang, far beyond the reach of ground-based observatories like LIGO. Learn why this massive undertaking relies on precise gold and platinum cubes orbiting millions of kilometers apart.

Short Summary

  • LISA requires $2.5 \text{ million km}$ baselines in space to detect lower-frequency gravitational waves from events like supermassive black hole mergers.
  • The mission relies on exquisitely stable $2\text{ kg}$ gold/platinum cubes ("test masses") floating freely within three separated spacecraft.
  • Precise laser ranging monitors spacetime distortion caused by passing waves, requiring complex corrections for relativity and radiation pressure.
  • US funding uncertainty threatens participation, potentially allowing China to lead in space-based gravitational wave science.

This conversation details the engineering marvel of LISA, contrasting it with LIGO, and explores its scientific goals—from stellar binaries to the cosmic background. It emphasizes that opening new observational windows, though costly, always yields unexpected discoveries that force science to advance.

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Description

Could LISA detect primordial black holes or gravitational waves from the Big Bang? Neil deGrasse Tyson and co-host Chuck Nice explore LISA and the future of gravitational wave astronomy with astrophysicist Kelly Holley-Bockelmann. Save LISA: https://www.savelisa.org/ How does LISA differ from LIGO? Learn about LISA, the Laser Interferometer Space Antenna, and how these spacecraft will help us detect gravitational waves from space. Why does it need three spacecraft millions of kilometers apart, linked by laser beams? And how can orbiting cubes of gold and platinum reveal the secrets of colliding black holes? Kelly explains why supermassive black hole mergers are her favorite cosmic events, how LISA could detect EMRIs–tiny black holes orbiting giants–and why the mission’s three-node triangular design matters. We explore the engineering challenges, from solar storms to relativity itself, and why interferometry is one of the most precise measuring tools ever invented. The conversation turns to funding, politics, and why U.S. withdrawal could leave China to take the lead. What technologies might spin off from LISA? Could we one day have GPS, but for the entire solar system? And could LISA finally detect primordial black holes or the faint gravitational hum of the Big Bang itself? Thanks to our Patrons Bobby, Ron Abernethy, yogesh job, Jared Richardson, cgillies87, John .A, Russell Hughes, Andy Revans, Darkeiser, TRacey Rankin, Anna Elliott, Andres Ortiz, Vavilov, Jeremy Nadeau, Mr Wolfgang, NorCalPhys, Advait Aithal, Alii Torres, Cody Pflieger, David Mauricio Perez de la Peña, Tommy Hadden, Kayce Rawlins, Ryan, Brian Hendershot, jenna Mich, smopeh, Boris Bendikov, Eileen, Matt Zullow, James Pickney, Micheal del Campo, Marsya, MomShikib, Syaz S., Jacob Harasymenko, Kevin Ingalls, Tom Reed, Paul S AKA Paul Biberdork, Treven Price, Tatiana, The Eye Child, STEPHEN R SMALL, Jedi_B0mbadil, Milton Flávio S. Teixeira, Davey_D, Mathys Marselis, fungus finder, Micheal French, Ngakora Beal, Mike Schaar-Ney, Robert Lima, Adam Small, Gonzalo Galetto, Nathan, DC, DGS DGS, Don, Mike McClelland, Arthur Pew, Matthew Vierra, Jeppe Fjordside, Sydney Wolf, and Caleb Carter for supporting us this week. Timestamps: 00:00 - Introduction: Kelly Holley-Bockelman 05:50 - LIGO vs. LISA 12:13 - Launching LISA 13:10 - Detecting Massive Black Holes, Binaries, & More 18:18 - The LISA Test Masses 23:30 - Correcting for Relativity & Noise 28:21 - Funding 34:03 - Solar System GPS & Lazer Communication 37:49 - US Place in Science 39:05 - Interferometry 42:48 - Building the Spacecraft 47:20 - Primordial Black Holes 51:12 - A Cosmic Perspective Check out our second channel, @StarTalkPlus Get the NEW StarTalk book, 'To Infinity and Beyond: A Journey of Cosmic Discovery' on Amazon: https://amzn.to/3PL0NFn Support us on Patreon: https://www.patreon.com/startalkradio FOLLOW or SUBSCRIBE to StarTalk: Twitter: http://twitter.com/startalkradio Facebook: https://www.facebook.com/StarTalk Instagram: https://www.instagram.com/startalk About StarTalk: Science meets pop culture on StarTalk! Astrophysicist & Hayden Planetarium director Neil deGrasse Tyson, his comic co-hosts, guest celebrities & scientists discuss astronomy, physics, and everything else about life in the universe. Keep Looking Up! #StarTalk #NeildeGrasseTyson

Top Comments (10)

@modeazystreamteam 2025-09-24

Tears came to my eyes when my fifth grade children perked up in the kitchen and said “ Oooooo Lisa! We know about Lisa. The NASA project. We learned about it in school.” Great job school! Keep my kiddos nerdin’ 🎉🎉

314 6 replies
@alexanderrohner6285 2025-09-23

channels like these is Internet at it's best! Bonjour from Switzerland

140 2 replies
@GarrettAnthony-74 2025-09-23

Science is so dope. I live for this stuff

137 11 replies
@StarTalk 2025-09-23

If LISA could detect gravitational waves from the Big Bang, what do you think we might learn about the origin of the universe?

119 56 replies
@LaSpookyEXE 2025-09-23

Why science gets defunded. If not I think that’s one of the most important things in the country to not only get ahead of other countries but, advance as a civilization.

84 26 replies
@beriiO 2025-09-24

I never expect to come to educational videos to laugh, but Chuck and Neil make such a great comedic duo. I love when they ask each other to translate 😂

44 1 replies
@Chickston 2025-09-23

Neil is in great form here. He went off on the Galileo candle thing then turned it immediately into an opportunity for the guest to explain their lasers.

41 1 replies
@agentmuldermd 2025-09-30

Kelly is absolutely beaming with enthusiasm and joy. She’s got the special sauce that makes wild discoveries. An uplifting interview.

23
@MichaelGioan 2025-09-24

Once again, thank you for letting us discover brilliant scientists who are also wonderful human beings.

20
@jpr1.6180 2025-10-11

Neil always looks like he's falling asleep whenever he is not the one who is speaking.

1

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