NASA astronaut Scott Kelly, who spent a year in outer space, is retiring in April

Expedition 46 Commander Scott Kelly of NASA smiles upon arriving at Ellington Field, Thursday, March 3, 2016 in Houston, Texas, after his return to Earth. The Soyuz TMA-18M spacecraft landed near the town of Dzhezkazgan, Kazakhstan, on Wednesday with Kelly and Russian cosmonauts Mikhail Kornienko and Sergey Volkov of Roscosmos. Kelly and Kornienko are completing an International Space Station record year-long mission to collect valuable data on the effect of long duration weightlessness on the human body that will be used to formulate a human mission to Mars. Volkov is returning after six months on the station. (Joel Kowsky/NASA via AP)

There won’t be any more space voyages for astronaut Scott Kelly, who recently made history by spending almost an entire calendar year aboard a spaceship.

NASA said Kelly joined the astronaut corps in 1996, and currently holds the American record for the most time spent in space. He has been on four space missions.

He and his twin brother, retired astronaut Mark Kelly, will still participate in research projects.

NASA said the unprecedented yearlong space station mission “aimed to expand the boundaries of space exploration beyond low-Earth orbit through the collection of critical data on how the human body responds to extended space missions.” On this mission, Kelly eclipsed two American space records.

“Records are meant to be broken,” Kelly said.

He broke the American record for most cumulative time in space during his one-year mission, accruing 520 days. provides commenting to allow for constructive discussion on the stories we cover. In order to comment here, you acknowledge you have read and agreed to our Terms of Service. Commenters who violate these terms, including use of vulgar language or racial slurs, will be banned. Please be respectful of the opinions of others and keep the conversation on topic and civil. If you see an inappropriate comment, please flag it for our moderators to review.

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