Elon Musk on Saturday reaffirmed his unwavering focus on colonizing Mars and making human life multi-planetary.
I hope there is a self-sustaining city on Mars in 20 years, the Tesla CEO said in a tweet.
self-sustaining civilization on the Red Planet mean being self-sufficient in terms of supplies and not relying on the Earth for them.
The timeline is assuming about 100,000 people are transported per flight and about 2 million people are needed, he added.
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