Explore astronomy, from the latest trip to the International Space Station to alien planets outside our solar system.
Lasers fired from the ground can locate and track debris as small as 4 inches across, protecting astronauts and satellites.
Respected scientist redefines gravity -- and possibly the way we see the universe.
Ninety-five asteroids are considered "near Earth," but none poses any threat to Earth anytime soon.
If the legislation passes, it would add another shuttle mission in 2011.
The gamma-ray burst and explosion of X-rays that followed came from a star that died 5 billion years ago.
Pulsars, or stars that pulse due to rapid spinning, may be the best way to keep time in space.
NASA does not have an overall strategy to keep its earth and space science missions on budget.
NASA Administrator Charles Bolden recently told Al-Jazeera network that one of the charges Obama gave him was "to reach out to the Muslim world."
The skies grew black in the middle of the day Sunday as the moon slipped in front of the Sun and aligned with the Earth.
The comet-chaser Rosetta transmitted its first pictures from the largest asteroid ever visited by a satellite.
Scientists lost communication with Galaxy 15 on April 5, and now they are concerned it will disrupt other satellites.
The flickering lights over our northern and southern-most skies at times seem like a mystical offering.
New research shows soft X-rays, once dismissed as interference, can help predict space storms that threaten Earth.
Finding the 'stuff of pencils' could reveal important insight into the start of life on Earth.
The image was painstakingly built up, slice by slice, by a $875 million telescope named Planck.
Activist and author blogs about politics, energy and Earth's resources.
Science journalist blogs about humans and other wildlife.