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Pegasus/AIM preview

An air-launched Pegasus rocket will loft NASA's AIM satellite into orbit to study mysterious clouds at the edge of space. On the eve of launch, officials held these briefings from Vandenberg Air Force Base, California.

 Mission | Science

The Sun in 3-D

NASA's twin STEREO spacecraft have made the first three-dimensional images of the Sun. Scientists unveil the images in this news conference held April 23.

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Hubble turns 17

The Hubble Space Telescope was launched in April 1990, opening a new window on the universe that has revolutionized our understanding of the cosmos.

 Full report

Flight of Gemini 3

The first manned flight of Project Gemini launched on March 23, 1965 with pioneering astronauts Gus Grissom and John Young. Take a look back!

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Apollo 9: Spider flies

Apollo 9 put the lunar landing module Spider through the stresses of spaceflight while orbiting Earth. This documentary looks back with astronauts Jim McDivitt, Dave Scott, and Rusty Schweickart.

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Expedition 15 coverage
The Russian Soyuz spacecraft with Expedition 15 cosmonauts Fyodor Yurchikhin and Oleg Kotov, along with tourist Charles Simonyi, fly to the space station.

 Full coverage

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BY JUSTIN RAY

Follow the countdown and launch of the Orbital Sciences Pegasus rocket with NASA's AIM spacecraft. Reload this page for updates.