Astronaut Buzz Aldrin Knows Something That We Don't Know About Mars!
The idea that Mars could have once been home to intelligent life is a theory that has become very popular in recent years. Discoveries like the so-called "Face on Mars" and the occasional sighting of flowing water have only fanned the flames of speculation.
Chances are, however, that you've never heard of the best possible evidence of intelligent life on Mars: the monolith on Phobos.
This is Phobos, one of Mars' two moons. It's a small, potato-shaped rock that makes its way around the red planet once every seven hours.
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Despite that bolstered attention, researchers haven't been able to determine what the structure is.