From Nasa.gov, simply go to the site, and if your browser has JAVA enabled, the app will appear in it's own window. It's called J-Track 3D and it shows the position of 900 satellites currently orbiting the Earth. You can rotate and zoom in and out of the real-time display, as well as click and identify specific satellites. It's fun to click on one, see the name of the satellite, then google it to find out what it does. Amazing.

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