SpaceX founder Elon Musk in a tweet once again spoke about a "permanent base" on the Moon. "It's been now almost 1/2 century since humans were last on the Moon. That's too long, we need to get back there," Musk tweeted.

Musk's mission: Build a city on Mars to become a 'spacefaring civilization', multi-planet species

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Musk's mission: Build a city on Mars to become a 'spacefaring civilization', multi-planet species