John and I welcomed Dr. Simone Marchi to discuss the asteroid that killed the dinosaurs, the type of rock that it was, where is likely came from, its composition and more. Our guest had much to say about the asteroid belt, also what lies beyond Jupiter in terms of big rocks. Our guest said that this could happen to Earth again so we talked about using resources for planetary defense or humans to the asteroids to learn more about them for defense. His response might surprise you. Our guest was also asked how long it took for life to die out over Earth after impact. Read the full summary of this program at www.thespaceshow.com for this date, Wednesda, Sept. 4, 2024.