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- RXTE Guest Observer Facility
NASA's X-ray Timing Explorer (XTE) is observing X-rays from white dwarfs, neutron stars, and black holes.
- RXTE Learning Center
Educational site that contains information on the satellite RXTE, x-ray astrophysics, and lesson plans which utilize real data.
- Scientific American: All in the Timing
A satellite observes the lightning-fast flickerings of cosmic objects.