New calculations indicate that Pluto might be the largest object in the outer solar system. Does it now deserve to be called a planet again?
For the first time, scientists have found a solar system that was not formed in the Milky Way galaxy. What's more, the planet is in danger of being eaten by its host star.
Researchers predict finding many Earth-sized planets around sun-like stars, right in our own galaxy. But don't pack your bags just yet – you might not want to live on them.
NASA's STS-32 crew took this view of the moon setting over the Earth's limb. Near the center is a semi-vortex in the clouds - a storm system in the early stages of formation. The moon's image is distorted due to refraction through the Earth's atmosphere.
The tip of the Boeing Delta II rocket with its MESSENGER spacecraft on top breaks through the billows of smoke below as it lifts off on Aug. 3, 2004 from Launch Pad 17-B at Cape Canaveral Air Force Station. MESSENGER (Mercury Surface, Space Environment, Geochemistry and Ranging) is on a seven-year journey to the planet Mercury. The spacecraft will fly by Earth, Venus, and Mercury several times to burn off energy before making its final approach to the inner planet on March 18, 2011.
Scientists said Thursday that they were confident the Kepler telescope had found a 'super Earth' exoplanet that orbits its star every 1.6 Earth days and is 1.5 times the size of Earth.
Kepler, the NASA telescope launched in March 2009, used the 'transiting' method to find two Saturn-size planets orbiting a star in the constellation Lyra.
A team of astronomers say they have found a solar system that includes at least five Neptune-like planets – all within the equivalent of Mars's orbit. There might be two other planets, as well, including the smallest exoplanet yet found.
At about 300 feet from the cargo bay of the space shuttle Challenger, Bruce McCandless II was farther out than anyone had ever been before. Guided by a Manned Maneuvering Unit (MMU), astronaut McCandless, pictured above, was floating free in space. McCandless and fellow NASA astronaut Robert Stewart were the first to experience such an 'untethered space walk' during Space Shuttle mission 41-B in 1984. The MMU works by shooting jets of nitrogen and has since been used to help deploy and retrieve satellites.
The Meteoritical Society meets this week in New York to discuss all things space rock.