Deep space and Earth's past
Season 2 Episode 8 | 27m 2s Video has closed captioning.
NASA's DAWN orbiter uses an ion engine to survey dwarf planet Ceres and asteroid Vesta; Astrophysicists launch a balloon carrying a 5,000-pound telescope into the stratosphere over Antarctica; NASA tests its Orion parachute system over an Army bombing range; A geologist examines rock samples and oxygen molecules to study planet Earth's "Great Oxidation Event" 2.5 billion years ago.
Problems Playing Video? | Closed Captioning