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 Date: 2014-07-05 15:08:11Local Group Spiral galaxies Pulsar Radio astronomy Galaxy Earth in science fiction Planet Extraterrestrial life Astronomy Space SETI |
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Date: 2014-07-05 15:08:11Local Group Spiral galaxies Pulsar Radio astronomy Galaxy Earth in science fiction Planet Extraterrestrial life Astronomy Space SETI |
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Figure 6.1 Collective Perspective