David Kipping — Astronomer and associate professor at Columbia University who hunts for exomoons and runs the Cool Worlds research lab and YouTube channel. Known for science communication on exoplanets, SETI, and cosmology.
The gist
Joe Rogan and astronomer David Kipping cover the surprising discoveries from the James Webb Space Telescope, including galaxies and supermassive black holes that formed earlier than models predict. They dig into how solar systems form, the diversity of exoplanets, and the Hubble tension over the universe's expansion rate. A long stretch explores the Fermi paradox, why we see no engineered stars, the possibility that humanity is alone, and whether AI civilizations are the inevitable endgame of intelligence. They also weigh UAP/UFO claims through a scientific lens, the simulation hypothesis, and the importance of funding next-generation telescopes like the Habitable Worlds Observatory. The conversation closes on competition, science communication, vulnerability on YouTube, and the harms of social media on kids.
Big reveals
- Kipping says the Hubble tension is now at five-sigma, meaning the mismatch in the universe's expansion rate is essentially certain and unexplained.
- Recounts nearly discovering the first exomoon (around PH2b), hyperventilating with excitement, then debunking it himself as a telescope glitch.
- Admits he is one of the few astronomers willing to concede humanity might genuinely be alone in the observable universe.
- Says Avi Loeb is 'off base' calling interstellar object 3I/ATLAS alien, since Hubble and James Webb confirm it's a comet with a coma and water.
- Pushes back on Elon Musk's near-certainty of living in a simulation, giving it 50/50 odds because lifelike simulations have never been demonstrated.
- Reveals the White House proposed slashing NASA's science budget by 50%, which would kill roughly 40 missions including the Habitable Worlds Observatory.
- Notes the Roman Space Telescope came from two spare Hubble-class spy telescopes the NSA handed to NASA.
- Describes arriving at Harvard as 'the moon guy' who was mocked, then out-publishing the senior professors to earn their respect.
Things worth remembering
- Mini-Neptunes, planets between Earth and Neptune in size, are the most common type of planet in the universe yet we have none in our solar system.
- Red dwarfs make up about 75% of all stars while only about 10% of stars are like our Sun.
- The ultimate telescope would use the Sun's gravity as a lens at ~550 AU, powerful enough to image cities on an exoplanet.
- Voyager 2's speed could cross the entire galaxy in two billion years, so even slow alien probes could have spanned it already.
- With 28,000 US military pilots flying ~5.6 million hours yearly, even a tiny error rate would generate hundreds of false UAP reports annually.
- The odds of a moderate protein assembling by random chance are about 10 to the power of 195, underscoring how unlikely life's origin may be.
- LUCA, the last universal common ancestor, has been dated to 4.2 billion years ago, only 200 million years after Earth's oceans formed.
- Astronomer Percival Lowell's 'canals' on Mars were likely reflections of the blood vessels in his own exceptional eyeballs.
- The James Webb telescope was budgeted at $800 million but ended up costing about $10 billion over roughly two decades.
- SpaceX's Starship could launch huge ground-based-style telescopes without the risky 200-point unfolding that James Webb required.