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Extraterrestrial aliens may possibly exist on other planets, or moons like Europa. Their biochemistry may be based on carbon as on Earth. More exotic space aliens may also be possible. Some scientists believe silicon based life is possible. In that case silicon would take the place that carbon takes in the biochemistry of Earth. Study or speculation about extra-terrestrial life is called Exobiology. Serious scientists with the SETI project are looking for alien signals but have so far found nothing conclusive. Not all scientists are convinced that aliens are likely.

There is no clear scientific evidence that aliens have ever contacted the Earth or influenced the Earth though many crazy people and quacks claim that aliens have contacted us. You should only believe serious scientists and avoid the crazy people and the crazy websites.

Extraterrestrial life doesn't have to mean intelligent aliens. Some scientists feel primitive life may be far more common in the universe than advanced life.

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Template:Stub astro

Adapted from Liberapedia

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