Atlantis and crew are set to undock early Wednesday after three spacewalks to upgrade the International Space Station.
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Expedition 21 Change of Command Ceremony; Atlantis to Undock Wednesday
Cassini Captures Ghostly Dance of Saturn's Northern Lights
In the first video showing the auroras above the northern latitudes of Saturn, Cassini has spotted the tallest known 'northern lights' in the solar system, flickering in shape and brightness high above the ringed planet. › Learn More | › Video
The Crab Nebula: A Cosmic Icon
A star's death was observed on Earth as the supernova of 1054 A.D. Almost a thousand years later, a neutron star left behind by the explosion spews out high-energy particles into the expanding debris field known as the Crab Nebula. › Read More
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