Space shuttle 'Endeavour' landed in Florida, capping a 16-day mission to complete Japan's orbital laboratory.
Apollo astronauts think the U.S. isn't getting its money's worth from the current space program.
The Lunar Worm is an never-developed vehicle designed to work in low-gravity environments.
Four Russians, a Frenchman and a German ended a 105-day stint in isolation, simulating a space trip to Mars.
What color is the sun? While it most often appears yellow or even orange, blue suns have been documented a few times throughout history.
NASA attempts to launch Endeavour on Sunday to delivery the last piece of Japan's Kibo laboratory to the International Space Station.
For the first time, researchers have witnessed the rebirth of an ordinary, slow-rotating pulsar into a superfast millisecond pulsar with an almost infinitely extended lifespan.
scientists have created the first-ever comprehensive computer model of sunspots.
The Mystery of the Missing Sunspots may have been Solved.
A long, deep canyon and remains of beaches are perhaps the clearest evidence of a standing lake on the surface of Mars.