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Fifteen Years Ago, Chandra X-Ray Observatory Deployed by Space Shuttle Crew

July 23, 2014

On July 23, 1999, a little more than seven hours after Space Shuttle Columbia and its five astronauts were launched ...

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Interactive Satellite Tracker
Interactive Satellite Tracker

Interactive Satellite Tracker (iSat) is a browser-based application that allows you to track all NASA Science Satellite Missions, as well as other satellites. Enjoy this free tool at home or in the classroom!

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Latest ScienceCast
Big Mystery in the Perseus Cluster

A mysterious X-ray signal from the Perseus cluster of galaxies, which researchers say cannot be explained by known physics, could be a key clue to the nature of Dark Matter.

Watch our latest ScienceCast: Big Mystery in the Perseus Cluster