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Cosmos
New Method Could Detect Alien Space Stations
As of February 5, we know of 136 extrasolar planets. These have been discovered in four ways: The first - called pulsar timing - allowed us to detect Earth-sized and smaller planets by studying the variations in arrival time of radiation generated by a pulsar. The next - Doppler spectroscopy - allows ground-based telescopes to measure the “shift” in a star’s spectrum caused by the gravity of an orbiting… more...
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