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. Some of those who support the Rare Earth hypothesis are serious scientists though many are Christians trying to convince us that the Earth must be special and was created by God for us and Christians like that often distort the facts if they hope they can win souls for Jesus.

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.

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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