The astronaut who prompted NASA's first medical evacuation earlier this year says doctors still don't know why he suddenly fell sick at the International Space Station.

NASA's Mike Fincke has identified himself as the astronaut whose medical condition prompted the space agency's first medical evacuation.

The astronauts evacuated last week from the International Space Station say a portable ultrasound machine came in “super handy" during the medical crisis.

An astronaut in need of medical care is on the way back to Earth.

The International Space Station is marking 25 years of nonstop human presence in orbit.

SpaceX has delivered a new crew to the International Space Station in just 15 hours.

Four astronauts are on their way to the International Space Station after being sidelined by Boeing's Starliner trouble and other issues.

On Wednesday, Oct. 7, 2020, Ferguson removed himself from the first Starliner crew, citing his daughters wedding in 2021. (James Blair/NASA via AP)CAPE CANAVERAL, Fla. – The commander of Boeing’s first astronaut flight has pulled himself off the crew so he’s on Earth — not at the International Space Station — for his daughter’s wedding next year. He has been replaced on the Starliner crew by NASA astronaut Butch Wilmore, who had been training as a backup for the test flight. In December or early January, Boeing plans to repeat a Starliner test flight without a crew, in hopes of reaching the space station this time. SpaceX, meanwhile, plans to launch its second astronaut flight at the end of this month.