A newly launched NASA-NOAA satellite observes the Earth at night.
Kelly and Kornienko brace for a challenging mission.
The moon took quite a beating in its early days.
A 2020 rover will be modeled after Curiosity.
Opportunity has uncovered hints of clay minerals in outcrops along a huge crater in Mars.
Twin spacecraft have captured the clearest sounds yet from Earth's radiation belts — and they mimic the chirping of birds.
Voyager 1 has entered the "magnetic highway", the last stop before interstellar space,
A NASA spacecraft has confirmed there's ice at Mercury's north pole.
A former space shuttle commander - whose twin brother is married to former Rep. Gabrielle Giffords - will attempt the longest spaceflight ever by an American.
The two men will spend a year aboard the International Space Station, gathering data to help prepare for future interplanetary missions.
