Explore astronomy, from the latest trip to the International Space Station to alien planets outside our solar system.
On the anniversary of Alan Shepard's first American spaceflight, the United States is at a turning point in space as the space shuttles are retiring and NASA is looking toward commercial spaceships for the future.
The exoplanet 55 Cancri e is 60 percent larger in diameter than Earth but eight times as massive, making the alien world the densest solid planet known – twice as dense as Earth.
Bonham's NY is poised to sell off some choice memorabilia this week to mark the 50th anniversary of NASA's first human spaceflight by Mercury astronaut Alan Shepard on May 5, 1961.
The Endeavour crew will do some light training and remain in pre-launch quarantine while repairs are finished on the shuttle.
Various forms of emotional support will be made available to the Italian through NASA and the European Space Agency.
Meteor shower will be more plentiful south of the Equator, but to the north the shower will be a little harder to enjoy.
Map could help explain how the universe expands, and give new insights into dark energy.
Delays are factored into each mission's budget to prevent costs from spiraling out of control.
The sun is the center of all life and energy for Earth. Check out these incredible images of the sun taken by NASA.
May 8 is the earliest possible launch date for Endeavour's final flight.
Video: NBC space expert James Oberg discusses the next phase in U.S. space exploration after NASA retires the shuttle program in June.
Maintenance and system checks means it will be at least two days until Endeavour is cleared to launch again.
Who named the shuttle Endeavour? How much did it cost to build? How did it help put the 'international' in International Space Station?
Striking photos taken on the eve of space shuttle Endeavour's final launch show a barrage of lightning that did not damage the spacecraft.
Forecasters said there was a 70 percent chance that weather conditions would be suitable for launch.
Eco-entrepreneur on politics, energy and Earth's resources.
Russell blogs about the day's top science and eco-news.