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There is no credible scientific evidence that humanoid aliens exist on any planet, and very little likelihood that they could exist undetected within our solar system. In fact, no trace of any Earth-like lifeform has been found anywhere except on Earth. There are also no signals from planets around other stars that would indicate they may harbor intelligent civilizations. This is in spite of many years of painstaking investigation of radio signals by SETI (Search for Extra-Terrestrial Intelligence).

There are, of course, three possibilities:

1) that Earth-like life exists only on Earth

2) that Earth-like life is as rare in other solar systems as it is in our own

3) that life exists almost everywhere and is only rarewithin our solar system

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8y ago

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