A spacewalk planned for Thursday outside the International Space Station was called off late Wednesday because of a "medical concern" with an unidentified crew member, NASA said in a statement. An ...

The U.S. is the only country to have ever sent humans to the moon.

NASA’s upcoming Artemis II flight will be the first crewed lunar mission in over 50 years, but it will not land on the moon. Here’s why.

In NASA's current missions, medical risks are manageable. There's the opportunity for emergency evacuations, real-time communications, and the ability to send samples to Earth. However, long-term ...