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A Sea of Ice
A Sea of Ice

The massive C-19 iceberg, which broke from the Ross Ice Shelf in Antarctica in May 2002, is the long smooth…

Dazzling Dunes of Mars
Dazzling Dunes of Mars

As NASA’s Mars Exploration Rover Opportunity creeps farther into “Endurance Crater,” the dune field on the crater floor appears even…

Grand Canyon in 3-D
Grand Canyon in 3-D

The Grand Canyon is one of North America’s most spectacular geologic features. Carved primarily by the Colorado River over the…

Spirit Drives to First Target
Spirit Drives to First Target

NASA’s Spirit rover has successfully driven to its first target on Mars, a football-sized rock that scientists have dubbed Adirondack.…

Earth’s Horizon
Earth’s Horizon

Airglow above Earth’s horizon and solar array panels add color to this scene of a portion of the International Space…

Discovery Lifts Off
Discovery Lifts Off

Framed by Florida greenery, Space Shuttle Discovery lifts off Launch Pad 39B at 10:39 a.m. EDT on the historic Return…

Omega Nebula: Close-Up of a Stellar Nursery
Omega Nebula: Close-Up of a Stellar Nursery

Sculpted by stellar winds and radiation, these fantastic, undulating shapes lie within the stellar nursery known as M17, the Omega…

A Day at Work
A Day at Work

STS-117 mission specialist Steven Swanson moves through a hatch in the Quest Airlock of the International Space Station as the…

Earth at Twilight
Earth at Twilight

No sudden, sharp boundary marks the passage of day into night in this gorgeous view of ocean and clouds over…

Mount Saint Helens
Mount Saint Helens

Mount Saint Helens exemplifies how Earth’s topographic form can change greatly even within our lifetimes. The mountain is one of…