Ten years ago, on July 23, 1999, NASA's Chandra X-ray Observatory was launched aboard the space shuttle Columbia and deployed into orbit. Chandra has doubled its original five-year mission, ushering in an unprecedented decade of discovery for the high-energy universe. With its unrivaled ability to create high-resolution X- ray images, Chandra has enabled astronomers to investigate phenomena as diverse as comets, black holes, dark matter and dark energy.

CLEVELAND -- NASA invites members of the news media to a tour of Glenn Research Center's Plum Brook Reactor Facility at 6 p.m. Tuesday, July 28. Program Manager Keith Peecook will lead the tour for Decommissioning community workgroup members. The tour is limited to media and workgroup members.

PASADENA, Calif. -- After careful evaluation and comparison between two outstanding candidate sites--Mauna Kea in Hawai'i and Cerro Armazones in Chile--the board of directors of the TMT Observatory Corporation has selected Mauna Kea as the preferred site for the Thirty Meter Telescope. The TMT will be the most capable and advanced telescope ever constructed.

Click on the image to load a 3 MB movie produced by Japan's MTSAT composed of images taken over the past 72 hours. [More images]

PASADENA, Calif. -- NASA's Spitzer Space Telescope has imaged a wild creature of the dark -- a coiled galaxy with an eye-like object at its center.

As the entire world celebrates the 40th anniversary of humankinds' first steps on the moon, gamers will soon have the chance to race other players on the moon's surface in their very own lunar racers.