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Image of the Day
Tethys in Sunlight

July 28, 2014

Tethys, like many moons in the solar system, keeps one face pointed towards the planet around which it orbits. Tethys' ...

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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