The composition of comet Hartley 2 suggests that comets might have been a bigger source of Earth's water than previously thought. It's also challenging models of solar system formation.
Asteroid Vesta is currently in the asteroid belt between Mars and Jupiter. Scientists recently discovered a huge mountain on the asteroid Vesta.
Scientists with the Messenger mission to Mercury unveiled their findings Thursday, which are answering some decades-old mysteries – but also creating new ones.
China has successfully launched the first component to build its own space station, indicating that it is closing the gap with the big space powers such as the US and Russia.
Tatooine is the mythical home of Luke Skywalker. Now, scientists have identified a planet in a binary system 200 light-years away, although the planet is more like Saturn in mass and makeup.
The design of the new NASA rocket draws on key systems from the space shuttle and Ares programs. The agency anticipates launching the first demonstration version of the rocket by 2017.
The V-2 rocket, pictured here in 1944, was a German ballistic missile developed at the beginning of WWI. Both the US and Soviet space programs were founded on V-2 technology, having employed the German rocket scientists after World War II.
Doom 2: Germany has eased restrictions on the 1993 game Doom and it's 1994 sequel, Doom 2. Why did it take so long?
Mars soil and rocks: The solar-powered workhorse beamed back images of the horizon, soil and nearby rocks that are unlike any it has seen during its seven years roaming the Martian plains.
Jupiter, perhaps more than any object in the solar system, is thought to hold the key to understanding planet formation. On Friday, NASA sends the Juno spacecraft hurtling toward Jupiter to probe the planet's constituent parts.