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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Roving rover: Curiosity takes first spin around Mars - 7 views
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Mars Panorama - Curiosity rover: Martian solar day 2 - 1 views
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