Origins: Earth Is Born


Episode Info

Astrophysicist Neil deGrasse Tyson measures Earth's 4.5-billion-year history in terms of one 24-hour day. This episode covers the first hour, when, he says, the planet was "beaten, bombarded, mangled and melted" for several hundred million years. But this was, he adds, "the best thing to happen to planet Earth" because it set the stage for the appearance of life.