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NASA shifted the orbit of its Mars satellite Odyssey to make better use of its infrared camera for mapping the surface.

The Space Shuttle Discovery will look like a fast-moving, bright star.

A recently discovered comet is making its closest approach to Earth in the next few days.

Orion is by far the most brilliant of the constellations and is visible from every inhabited part of the Earth.

Orion is by far the most brilliant of the constellations and is visible from every inhabited part of the Earth.

Many have been fooled into thinking that it's beginning of morning twilight.

Scientists have created a 3-D picture of a luminous and mountainous site on the moon.

Scientists have observed dark energy stretching vast regions of the universe called superclusters and supervoids.

The most important sky map line is the ecliptic, the sun's apparent path.

Phoenix used its robotic arm to image underneath itself, white one of its instruments short-circuited.