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The only planet we know for sure today is the Earth.

We know that the other planets are either too cold, too hot, or have been observed to have no atmosphere to support life.

It is only on planet earth that we have observed actual life.

It is not impossible that primitive life can still be found on other planets in our solar system, but it will likely be very extreme bacteria etc. Complex life like multi-celled organisms do not exists on other planets in our solar system.

We do not know for sure if complex life exists on other planets outside our solar system. The primary reason that we do not know, is that we have not been able to observe planets outside our own solar system.

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15y ago

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