Scott Kelly and Mark Kelly are American astronauts and identical twin brothers. They participated in NASA's Twins Study, ...

Sen. Mark Kelly (D-Ariz.) clapped back at tech billionaire Elon Musk after he called Kelly a “traitor” for visiting Ukraine ...

Elon Musk called Democratic Sen. Mark Kelly a "traitor" in a post on X after Kelly posted that he had visited Ukraine over ...

Senator Mark Kelly, an Arizona Democrat and former astronaut, visited Ukraine over the weekend and said the United States ...

President Donald Trump’s increasingly influential adviser, Elon Musk, called Sen. Mark Kelly (D-AZ) “a traitor” over a social ...

Kelly added more comments on X Monday about the U.S.’ change in policy after saying he made the trip with his twin brother, ...

Scott Kelly, a former astronaut, discussed the return of NASA astronauts from the International Space Station on Fox News. He ...