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NASA has decided to bring the four astronauts of SpaceX's Crew-11 mission home from the International Space Station early due to a medical issue experienced by a crewmember in orbit.

"Nothing in my professional training as an X-ray astronomer had prepared me for something like this."

NASA just postponed a spacewalk because of a medical concern with an astronaut. Here's how the agency has handled such issues in the past.

The Vera Rubin Observatory has found 19 new "superfast rotator" asteroids, including the fastest-spinning big space rock ever found.

Auroras may be visible from Alaska to New York as incoming coronal mass ejections and high-speed solar winds could trigger geomagnetic storms tonight.

Gerard Butler and Morena Baccarin return in an epic sci-fi survival sequel to 2020's surprise hit, "Greenland".

"We're going to do it in three years, and we're going to do it for a ridiculously low price."

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On January 8, 1973, the Soviet Union launched the Luna 21 mission to land a rover on the moon.

Solar system comets are often at their brightest as they draw close to the sun