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A Year in Space

The Twin Study

Season 1 Episode 2 | 2m 54s

While Scott Kelly spent a year on the International Space Station, his twin brother Mark spent a year on earth. By analyzing the differences between the two men, NASA researchers hope to gain insight into the effects of spaceflight on the human body.

Extras
Watch • 8:32
Nature
NATURE - Season 45
Get a sneak peek at a brand new season of NATURE on PBS.
Preview: S45 | 8:32
Watch • 2:37
American Masters
Mary Oliver: Saved by the Beauty of the World
Celebrate the life and career of Pulitzer Prize-winning poet Mary Oliver.
Preview: S40 E5 | 2:37
Daniel Tiger's Neighborhood
Look Closely Gameplay
Explore and look closely at many things in the Enchanted Garden along with Daniel Tiger.
Clip: 13:47
Daniel Tiger's Neighborhood
Stargazing Gameplay
Watch as Daniel and O the Owl embark on an out-of-this-world journey filled with learning, and fun.
Clip: 3:38
Daniel Tiger's Neighborhood
My Fish Tank Gameplay
Relax and unwind with Daniel as he watches the fish!
Clip: 9:01
Daniel Tiger's Neighborhood
Classroom Helpers Gameplay
You can be a helper along with Daniel's classmates by caring for and cleaning up the classroom.
Clip: 4:00
Daniel Tiger's Neighborhood
At the Dentist Gameplay
Get ready for the best dentist visit ever with Daniel and Dino.
Clip: 7:02
Daniel Tiger's Neighborhood
My Bedtime Gameplay
Everyone in the neighborhood has a special bedtime routine!
Clip: 8:53
Daniel Tiger's Neighborhood
Dress Up Gameplay
There are lots of different clothes that neighbors wear... Let's dress up and pretend.
Clip: 4:06
Daniel Tiger's Neighborhood
Bathrooms Gameplay
Learn along with Daniel Tiger about all the sights and sounds of different bathrooms.
Clip: 5:54
Latest Episodes
Watch • 54:10
A Year in Space
Beyond A Year in Space
Beyond A Year in Space follows Scott Kelly's return to Earth and NASA's Twin Study.
Episode: S1 E2 | 54:10
Watch • 55:37
A Year in Space
A Year in Space
A Year in Space gives viewers a window into astronaut Scott Kelly’s unprecedented mission.
Episode: S1 E1 | 55:37