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Intelligent life forms and our solar system

By Marina Koren

What is the possibility that intelligent life forms with technological capabilites ever existed in our solar system?

Main titles

Technosignatures may exist that prove existence of indigenous species.

Any evidence may have been erased by shifting techtonic plates.
Intelligence species could have arisen in Mars and Venus, before their water evaporated.
Any evidence that life existed on Mars could still be found beneath the surface.