Mark Kelly has been a U.S. Navy combat pilot, a U.S. Navy captain, and piloted the Space Shuttle Endeavour. But his next mission is running for U.S. Senate.
The retired astronaut announced his bid for Senate in Arizona Tuesday.
In a video posted to his campaign website, Kelly said, "It becomes pretty obvious pretty early when you get into space that we're all in this together."
Kelly has been a fierce advocate for tougher gun control laws. In 2011, his wife, former U.S. Rep. Gabby Giffords, was shot in the head during a meeting in Tucson, Arizona.
"I learned a lot from being an astronaut. I learned a lot from being a pilot in the Navy. I learned a lot about solving problems from being an engineer," said Kelly, "But what I learned from my wife is how you use policy to improve people's lives."
If he wins the Democratic nomination, he'll challenge Republican U.S. Sen. Martha McSally, who was appointed to fill the seat vacated by the late John McCain.