"How to Build a Habitable Planet with James Kasting"

We have Carl Sagan to thank for our obsession with aliens. Starting in the 1960s, the Brooklyn-born astrophysicist popularized the idea that extraterrestrial life does, in fact, exist. Today at AMNH, planetary evolution specialist James Kasting discusses the ways that scientists are testing Sagan’s theories—and why we are likely not alone.