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2:54
Scott and Mark Kelly undergo studies to understand the effect of spaceflight on the body.
2:00
Astronauts Scott Kelly and Jessica Meir discuss the importance of the Twin Study.
2:46
The astronauts take in the history of spaceflight at the Kennedy Space Center.
0:48
As they orbit the Earth, astronauts have a unique perspective on the wealth and poverty.
2:11
Twin astronauts Scott and Mark Kelly are ideal subjects for studying the effects of space.
0:37
We dream of traveling across the solar system. But what compels us to reach for the stars?
0:40
Scott Kelly stays connected to people on Earth with Twitter and Instagram. #YearinSpace
0:43
As he heads into space, Scott Kelly must say goodbye to everything he knows and loves.
1:59
A huge belt of space debris orbits Earth- a single piece could be fatal.
