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| Is Anybody Out There?(4) | |
| 摘 要： | In the long term,says Tipler.even extraterrestrials with a tendency to be couch potatoes would have to move on. "Just as the sun will turn into a red giant and force us to leave the Earth, the stars of alien races would eventually force them to go forth and colonize. "Nothing, it appears, can deflect Tipler from his almost messianic conviction that we are alone in the gal- |
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