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The top documents tagged [pc thickness]
The Search for Extraterrestrial Intelligence Can E.T. hear me know?
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18 The Search for Extraterrestrial Intelligence E.T. phone home using 10-10-220
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The Milky Way Galaxy. The Milky Way We see a band of faint light running around the entire sky. Galileo discovered it was composed of many stars. With
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Thin, Cold Strands of Hydrogen in the Riegel-Crutcher Cloud
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