"A Journey Into the Chicxulub Impact Crater" --Death of an Epoch 66 Million Years Ago (WATCH Today's 'Galaxy' Stream)

When the Chicxulub asteroid slammed into Earth about 66 million years ago, it obliterated 80 percent of Earth's species, blasted out a crater 200 kilometers across, and signaled an abrupt end to the Cretaceous Period. The impact, its catastrophic effects,...