Ka Chun finishes up with a look at two planets in our own solar system. Venus is Earth’s sister planet, similar in size and mass. But Venus has a much thicker atmosphere. How did the atmospheres of Earth and Venus end up so different? One theory suggests Earth may have had a more massive atmosphere early in its history but lost it due to impacts.
60 Minutes in Space - Scientists from the Space Sciences Department at the Denver Museum of Nature & Science take you "behind the stories" using the best images and animation available to help understand the latest developments.