What two discoveries suggest about life in the solar system

Aired: 3/6/2015 | 0:04:08 | Clip
Science correspondent Miles O’Brien joins Judy Woodruff to discuss two space stories that center around the search for life and how it began. NASA’s Dawn spacecraft arrived in orbit around the dwarf planet Ceres, which scientists believe shows signs of life-sustaining water. Meanwhile, new research found that Mars once had enough water to cover 20 percent of the planet.