National Aeronautics and Space Administration

NASA astronaut Mike Massimino is using Twitter to provide a unique, behind the scenes peek at the last weeks of his training for the fifth and final shuttle servicing mission to NASA's Hubble Space Telescope.

The 19th crew to live and work aboard the International Space Station launched into orbit Thursday morning from the Baikonur Cosmodrome, Kazakhstan, aboard a Soyuz spacecraft. NASA astronaut Michael Barratt, Russian cosmonaut Gennady Padalka, and spaceflight participant and U.S. software engineer Charles Simonyi lifted off at 6:49 a.m. CDT.

NASA and Microsoft Corp. announced Tuesday plans to make planetary images and data available via the Internet under a Space Act Agreement.

After a seven-day, 2,917-mile journey, a train carrying the four motor segments for the Ares I-X rocket arrived Thursday at NASA's Kennedy Space Center in Florida. The motor is the final hardware needed for the rocket's upcoming test flight this summer.

NASA’s Orbiting Carbon Observatory satellite failed to reach orbit after its 4:55 a.m. EST liftoff Tuesday from California’s Vandenberg Air Force Base.

A NASA-funded study describes how extreme solar eruptions could have severe consequences for communications, power grids and other technology on Earth.

NASA is inviting interested industry representatives, academics and reporters to learn more about the Ares V heavy lift-launch vehicle, the Altair lunar lander, and the roles they will play in returning humans to the moon by 2020.

NASA's newest observatory, the Gamma-ray Large Area Space Telescope, or GLAST, has begun its mission of exploring the universe in high-energy gamma rays. The spacecraft and its revolutionary instruments passed their orbital checkout with flying colors.

Using a novel theoretical approach, researchers from NASA and other institutions have identified the common thread that determines how aerosols from human activity, like the particles from burning of vegetation and forests, influence cloud cover and ultimately affect climate. The study improves researchers’ ability to predict whether aerosols will increase or decrease cloud cover.

In commemoration of NASA's Hubble Space Telescope completing its 100,000th orbit during its 18th year of exploration and discovery, scientists aimed Hubble to take a snapshot of a dazzling region of celestial birth and renewal.