GWTC-5 Gravitational Wave Census, Tianwen-2 at Kamoʻoalewa & TESS Microlensing
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GWTC-5 Gravitational Wave Census, Tianwen-2 at Kamoʻoalewa & TESS Microlensing
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(00:01:02) TESS Microlensing Exoplanet Discovery
(00:02:01) Tianwen-2 at Kamoʻoalewa
(00:02:44) Curiosity Polygon Terrain Mars
(00:03:11) NASA Isolation Study and Birthday Images
Gravitational wave astronomy just crossed a major threshold. The LIGO-Virgo-KAGRA collaboration has released GWTC-5, its fifth and largest catalog, logging 390 confirmed detections including 161 new events captured between April 2024 and January 2025. The catalog contains the strongest gravitational wave signal ever recorded, the first measurement of three simultaneous vibrational modes from a single black hole, and compelling evidence for second-generation black holes formed from prior mergers. The science has shifted from celebrating individual events to reading black hole populations at scale.
On the exoplanet front, NASA's TESS space telescope achieved a first: detecting a planet via gravitational microlensing. The planet, Gaia23bra b, is a super-Jupiter located roughly 40,000 light-years away. Because microlensing events are one-time and non-repeating, the discovery lives entirely in archival data — but it opens TESS to a class of distant, wide-orbit worlds that transit photometry simply cannot reach.
China's Tianwen-2 mission has arrived at Kamoʻoalewa, a small quasi-satellite of Earth between 40 and 100 metres across. The spacecraft is preparing to collect and return samples that could confirm whether this unusual object is an ancient fragment of the Moon.
Also in today's episode: NASA's Curiosity rover is navigating mysterious polygonal terrain and unidentified dark rocks in Gale Crater; NASA is recruiting volunteers for a year-long isolation study ahead of future deep-space missions; and Chandra X-ray Observatory released four stunning multi-telescope composite images to mark America's 250th anniversary. A common thread runs through all of it — the biggest discoveries right now come from combining instruments, not upgrading them.
This episode includes AI-generated content.
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