Ancient cataclysms are believed to have left Mars barren, but science continues to find clues that this red planet was once blue and capable of producing life. For centuries, humanity has been fixated on Mars, the glowing red orb in the night sky. As a new era of exploration of the Red Planet begins, humans are on the cusp of finally solving the Red Planet's mysteries.

A look at whether time travel has already occurred, on purpose or by accident, and scientists who believe it is theoretically possible.

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