"The last thing we need to be doing is taking life from Earth to Mars. Robotic exploration is the way to go." Professor Andrew Coates warns that human settlers could contaminate Mars, jeopardizing the search for alien life.
"If civilization is reasonably stable for the next ~30 years, a self-sustaining city of a million+ people will be built on Mars." Musk envisions a thriving human settlement, but scientists raise concerns over contamination.
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