If the planets exist, they orbit a star about twice as old as our own, so a suitable planet has had plenty of time to develop life much more advanced than Homo sapiens. That may just explain why no one from Tau Ceti has ever contacted beings as primitive as us.
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A world like ours, maybe, or too smart to say - 5 views
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Reflections of a Science Teacher: The Water Has Moved On - 2 views
Short Lessons on the Water Cycle - 1 views
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