New research reveals how flying exposes us to cosmic rays. It's time we were aware of the risks.
The astronaut is about to come back to Earth after spending 340 consecutive days in space along with Russian cosmonaut Mikhail Kornienko.
A NASA mission reveals what happened to the water on Mars's atmosphere.
The agency is set to announce details on Thursday at 2 p.m. ET.
This feast is the first of its kind.
NASA has launched a "Journey to Mars" challenge to get input and is offering $5,000 or more to up to three winners.