Explore astronomy, from the latest trip to the International Space Station to alien planets outside our solar system.
Photos of Tempel 1 will probably be the Stardust spacecraft's last as it is running low on fuel.
Budget does provide money for NASA to assist private companies in funding commercial spaceflight.
Obama would restrict NASA's budget to last year's levels of $18.7 billion, a 1.6-percent decrease from the spending total the agency had sought.
Space radiation can damage sperm and cause sterility.
NASA proposal seeks $160 million from companies to pay for Mars trip and colony.
NASA hopes the glimpse of the comet will help scientists understand how comets form.
The "landing" marks the halfway point for participants spending 520 days in isolation to test how humans would respond to the long voyage to Mars.
Former NFL player turned astronaut encourages children to 'become scientists and engineers.'
A new study that suggests the first stars in the universe may have formed in groups instead of in isolation, as previously thought, has also found something else: Under the right conditions, some of these first stars may be visible today.
A measuring tool fell during repair work, but the accident has not compromised Discovery's February 24 mission to the International Space Station.
Lack of witness and apparent video tampering point to the videos show a UFO in Jerusalem as false.
The Competitive Space Task Force calls for more opportunities for private investments in space travel and scientific research.
A small asteroid will pass Earth on Wednesday — the second space rock in five days to fly so close — but will pose no threat.
Images can improve space weather forecasts made for power companies and airlines.
Companies aim to have the launcher ready by 2013, with financial backing from NASA.
Eco-entrepreneur on politics, energy and Earth's resources.
Russell blogs about the day's top science and eco-news.