NASA astronaut Mark Kelly on the flight deck of the space shuttle Discovery during the STS-124 mission in June 2008. (Image credit: NASA) Kelly logged more than 54 days on four space shuttle missions.

Arizona's U.S. Sen. Mark Kelly and his twin brother, Scott Kelly, slammed Elon Musk after he insulted another astronaut on X.

Arizona Sen. Mark Kelly knows a few things about objects in outer space, including those that make their way to Earth.

Sen. Mark Kelly (D-AZ) blasted Elon Musk Friday, implying the SpaceX CEO was too afraid to travel into space as two other astronauts also laid into the billionaire. Kelly’s attack on Musk came ...

Sen. Mark Kelly and his twin brother clashed with Trump adviser and world’s richest man Elon Musk after Musk claimed that a pair of astronauts were left on the International Space Station for ...

The next presidential election is still a few years away, but Arizona's senators could be contenders in a wide-open ...

As the nation reels from the latest outbreak of political violence, the senator from Arizona and his wife, former Rep. Gabby ...

Sen. Mark Kelly, D-Ariz., was considered a potential vice presidential pick by Kamala Harris. The former NASA astronaut is married to Gabby Giffords, the former congresswoman who was shot in 2011.

Mark Kelly the astronaut, along with identical twin Scott Kelly, the astronaut. In 1996, Mark Kelly was selected as an astronaut in the same NASA class as his identical twin brother, Scott Kelly.

Mark Kelly knows a thing or two about flying high—both literally and otherwise. As a NASA astronaut, he was part of four space shuttle missions between 2001 and 2011, amassing more than 54 days ...