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'Man on the Moon' Challenge, 50 Years On

Fifty years ago, on May 25, 1961, U.S. President John F. Kennedy issued a grand challenge that changed the world as humankind knew it - to send a man to the Moon and bring him home again, and to do it by the end of the decade.

MESSENGER Probe Sends First Mercury Images

The U.S. space agency has released the first ever image taken of the surface of Mercury from a spacecraft orbiting the planet.

US Space Shuttle Discovery Launched on Final Flight

The Space Shuttle Discovery is now on its way to the International Space Station after what NASA calls "a picture perfect launch" from the Kennedy Space Center in Florida Thursday. This is the last flight of the oldest and most-travelled of the US shuttles. Discovery and its six-member crew is expected to reach the orbiting International Space Station Saturday.

Space Shuttle Challenger Loss Still Felt, 25 Years Later

Each January, the U.S. space agency NASA holds a Day of Remembrance to honor those who have lost their lives in the pursuit of space exploration. It also marks 25 years since the loss of the space shuttle Challenger, which stunned the nation and changed America's space program.

Consumer Electronics Show Features Tablet Computers, Smart Phones

The latest electronic devices are being unveiled this week at the Consumer Electronics Show in Las Vegas Thursday through Sunday. Among the hottest gadgets at the annual trade show are tablet computers, which will compete with Apple's successful iPad.

Blood Test May Revolutionize Cancer Treatment

One of the most exciting developments in cancer research in the past decade involves trials going on right now at four cancer treatment centers in the United States. The centers are using a highly sensitive, new blood test developed at Massachusetts General Hospital in Boston. The test may revolutionize the way cancer is treated.