Despite appearances, Elon Musk is not the first person to set his eyes on building a settlement on Mars.

Decades ago, the renowned astrophysicist Carl Sagan emphasized the need for humans to become a multi-planet species before the "shooting range" of asteroids in our solar system struck Earth again.

Sagan has since passed away, but popular theoretical physicist and futurist Professor Michio Kaku of CUNY says the interplanetary baton is now in the hands of Elon Musk — the outspoken CEO of SpaceX — to revive Sagan's dream of a spacefaring civilization, according to a recent YouTube video interview with Big Think.

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