Scott Kelly of NASA is seen after returning to Ellington Field in Houston, Texas on March 3, 2016.
By Katie Reilly
March 4, 2016

American astronaut Scott Kelly returned to Earth this week after spending a year in space and will speak about the experience in a NASA news conference on Friday afternoon.

Kelly spent a year on the International Space Station, a mission that aimed to to help scientists understand the effects of prolonged zero-gravity exposure on the human body. Kelly’s twin brother, a retired astronaut, participated in parallel studies on Earth.

Kelly and Russian cosmonaut Mikhail Kornienko landed back on Earth in Kazakhstan on Tuesday after a historic 340 days in space.

Read more: Inside the Gigantic Operation to Meet Astronauts Coming Home

TIME chronicled the year-long mission for a documentary series, A Year in Space, which premiered Wednesday on PBS.


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