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It’s a U.S. Record! Cumulative Days in Space: 383

It’s a U.S. Record! Cumulative Days in Space: 383


Today, Astronaut Scott Kelly has broken the record for longest time spent in space by a U.S. astronaut! Over the course of his four missions, Kelly has spent 383


days in space. This record was previously held by Astronaut Mike Fincke, with 382 days in space over three flights. Here are some more fun facts about this milestone:

  • 4: The number of humans that have spent a year or more in orbit on a single mission
  • 215 Days: The record currently held by Mike Lopez-Alegria for most time on a single spaceflight by U.S. astronaut. On Oct. 29, Kelly will break this record
  • 377 Days: The current record for most days in space by a U.S. female astronaut, held by Peggy Whitson
  • 879 Days: The record for most cumulative days in space by a human, currently held by Russian cosmonaut Gennady Padalka

Why Spend a Year in Space?

Kelly’s One-Year Mission is an important stepping stone on our journey to Mars and other deep space destinations. These investigations are expected to yield beneficial knowledge on the medical, psychological and biomedical challenges faced by astronauts during long-duration spaceflight.

Kelly is also involved in the Twins Study, which consists of ten separate investigations that are being conducted with his twin brother, who is on Earth. Since we are able to study two individuals who have the same genetics, but are in different environments for one year, we can gain a broader insight into the subtle effects and changes that may occur in spaceflight.

For regular updates on Kelly’s one-year mission aboard the space station, follow him on social media: Facebook, Twitter, Instagram.

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