International Space Station managers and the international partners approved plans late Friday for a spacewalk Saturday by Expedition 35 crew members Chris Cassidy and Tom Marshburn out of the Quest airlock of the U.S. segment of the com...

When we look into the distant cosmos, the great majority of the objects we see are galaxies: immense gatherings of stars, planets, gas, dust, and dark matter, showing up in all kind of shapes. This Hubble picture registers several, but t...

Following Thursday's identification of an ammonia coolant leak outside the International Space Station, the Expedition 35 crew Friday began preparing for a possible spacewalk Saturday. Mission managers are discussing the information that...

Storing super-cold propellants is not easy on Earth, but it doesn't seem to be much easier to accomplish in space either. That's not stopping engineers from trying to perfect technologies, though. "The longest we've kept liquid propel...

PASADENA, Calif. -- The team operating NASA's Curiosity Mars rover has selected a second target rock for drilling and sampling. The rover will set course to the drilling location in coming days. This second drilling target, called "C...

PROVIDENCE, R.I. [Brown University] —Water inside the Moon's mantle came from primitive meteorites, new research finds, the same source thought to have supplied most of the water on Earth. The findings raise new questions about the proce...

At around 10:30 a.m. CDT on Thursday, the Expedition 35 crew reported seeing small white flakes floating away from an area of the International Space Station’s P6 truss structure. The crew used handheld cameras and Mission Control used e...

WASHINGTON -- Sierra Nevada Corp. (SNC) Space Systems of Louisville, Colo., has completed its first major, comprehensive safety review of its Dream Chaser Space System. This is the company's latest paid-for-performance milestone with NAS...

During a scheduled semi-weekly contact on Friday, May 3, 2013, engineers discovered that the Kepler spacecraft was in a self-protective state called a safe mode. The spacecraft was returned to science data collection just before midnight...

Gone are the days of being able to count the number of known planets on your fingers. Today, there are more than 800 confirmed exoplanets -- planets that orbit stars beyond our sun -- and more than 2,700 other candidates. What are these ...