Explore astronomy, from the latest trip to the International Space Station to alien planets outside our solar system.
The famed cosmologist outlines several ideas for crossing through time.
British scientists are developing a solar sail designed to clear space of dangerous debris.
At $102,000 a ride, Space Adventures is selling 'cheap seats' on new suborbital rocket ships.
28 future science missions planned to look for extraterrestrial life.
The European Extremely Large Telescope will be constructed on a mountainside in the Atacama Desert.
Space agency is currently deciding where the veteran shuttles will reside.
Part of Obama's mission to reach Mars is preventing asteroids from hitting our planet.
Video: President Obama lays out his vision for the future of NASA and for maintaining U.S. leadership in human space flight in remarks at John F. Kennedy Space Center.
Video: Former astronauts Neil Armstrong, James Lovell and Gene Cernan urge President Obama to reconsider what they warn could be 'devastating' new policies for the future of NASA.
Previously unknown comet recorded by the Solar and Heliospheric Observatory that watches the sun.
Assembly and test preparation have begun on a probe scheduled to visit our system's largest planet.
Obama administration grants $2.4 billion over 5 years to help scientists investigate Earth-bound problems, including climate change.
Scientists explore response options if aliens ever make first contact.
Commercial company Orbital Sciences is building a new transport vehicle for the space station.
Scientist declares Star Trek's favored speed of transport deadly to humans.
Activist and author blogs about politics, energy and Earth's resources.
Science journalist blogs about humans and other wildlife.