NASA astronaut Scott Kelly, who is wrapping up an unprecedented 340-day mission aboard the International Space Station.

NASA astronaut Scott Kelly, who is wrapping up an unprecedented 340-day mission aboard the International Space Station.

2015 The Year Ahead Scott Kelly Time Magazine Cover. The Kelly brothers- one in orbit and one on Earth- will help us learn how humans change when they leave the planet.

Meet the Twins Unlocking the Secrets of Space

2015 The Year Ahead Scott Kelly Time Magazine Cover. The Kelly brothers- one in orbit and one on Earth- will help us learn how humans change when they leave the planet.

The view from the International Space Station tweeted by Scott Kelly.

The view from astronaut Scott Kelly's new home 200 miles above Earth

Astronaut Scott Kelly presents a gallery of storms on Earth seen from the International Space Station.

Astronaut Scott Kelly presents a gallery of storms on Earth seen from the International Space Station.

51 Favourite Photos from Astronaut Scott Kelly's First Six Months in Space April 27, 2015: “Sometimes Earth looks like another planet.” Image credit: NASA/Scott Kelly

51 Favourite Photos from Astronaut Scott Kelly's First Six Months in Space

51 Favourite Photos from Astronaut Scott Kelly's First Six Months in Space April 27, 2015: “Sometimes Earth looks like another planet.” Image credit: NASA/Scott Kelly

NASA astronaut Scott Kelly is seen inside the Cupola, a special module which provides a 360-degree viewing of the Earth and the International Space Station July 12, 2015 in space.

Scott Kelly says he's an environmentalist after his year in space

NASA astronaut Scott Kelly is seen inside the Cupola, a special module which provides a 360-degree viewing of the Earth and the International Space Station July 12, 2015 in space.

The picture was taken by Astronaut Scott Kelly on August 9, 2015, the 135th day of his one-year mission in space on the International Space Station. The Milky Way stretches the curve of Earth in the scene that also records a faint red, extended airglow. The galaxy's central bulge appears with starfields cut by dark rifts of obscuring interstellar dust. Since November 2000, people have been living continuously on the International Space Station.

The picture was taken by Astronaut Scott Kelly on August 9, 2015, the 135th day of his one-year mission in space on the International Space Station. The Milky Way stretches the curve of Earth in the scene that also records a faint red, extended airglow. The galaxy's central bulge appears with starfields cut by dark rifts of obscuring interstellar dust. Since November 2000, people have been living continuously on the International Space Station.

Astronaut Scott Kelly visited our school today

Astronaut Scott Kelly visited our school today

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