Episode Details

The Space Show welcomed award-winning author and former Caltech radio astronomer Marcus Chown to discuss his latest book, A Crack in Everything: How Black Holes Came in from the Cold and Took Cosmic Center Stage. Chown shared his journey from early inspiration—thanks to a childhood astronomy book and the moon landing—to his current career as a science writer/journalist. He also noted the success of his previous book, The Ascent of Gravity, named the Sunday Times Science Book of the Year.

Chown traced the transformation of black holes from theoretical curiosities to essential cosmic players. He described the 1971 discovery of the first black hole in the Cygnus X-1 system and explained how supermassive black holes were surprisingly identified before stellar-mass ones, thanks to observations by the Hubble Space Telescope. He clarified that while black holes themselves emit no light, matter falling into them creates bright emissions.

Chown highlighted the overlooked contributions of women in astronomy, especially Louise Webster, co-discoverer of black holes. He emphasized black holes’ vital role in galaxy formation and the intriguing theory that their presence may influence the emergence of life.

Chown detailed how light elements formed in the Big Bang, while heavier ones like uranium and thorium emerged in supernovae. The 2017 detection of gravitational waves from neutron star mergers revealed the origin of precious metals like gold and platinum, solving a long-standing mystery. He also explained that gamma-ray bursts, once detected by military satellites, are linked to these cataclysmic events. This was in response to a question by Dr. Kothari. In addition, his discussing regarding uranium, thorium, and plutonium helped to explain that only specific isotopes are fissile due to nuclear forces. These elements contribute to Earth's heat and helium production. He praised physicist Lise Meitner, co-discoverer of nuclear fission and developer of the liquid drop model, who was nominated 49 times for the Nobel Prize but never awarded.

Chown addressed how James Webb Space Telescope findings—such as unexpectedly bright early galaxies and potential newborn supermassive black holes—challenge current galaxy formation theories. He explored speculative ideas, including advanced civilizations possibly harnessing black hole energy, and the elusive role of dark matter in cosmic structure.

I had Marcus if he had any concerns about what may be a U.S. pull back from science and engineering for budgetary reasons. I wanted to know if thought there were other players that might step in and fill the void left by the U.S. were the pull back to happen. Marcus expressed concern over a potential U.S. retreat from scientific leadership, emphasizing the difficulty other nations would face in filling that gap. He reflected on Roy Kerr’s 1963 rotating black hole solution, overshadowed at the time by quasar discoveries. Looking ahead, he encouraged continued exploration and proposed future discussions on dark energy.

I closed by reminding listeners that The Space Show is a listener-supported 501(c)(3) nonprofit and encouraged donations to help sustain the program.

Special thanks to our sponsors:Northrup Grumman, American Institute of Aeronautics and Astronautics, Helix Space in Luxembourg, Celestis Memorial Spaceflights, Astrox Corporation, Dr. Haym Benaroya of Rutgers University, The Space Settlement Progress Blog by John Jossy,

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