The article is adapted from Musk’s presentation at the International Astronautical Congress and begins with an argument for why we should focus on Mars for our move towards interplanetary life. Musk then notes that with current technologies, a ticket to Mars would cost around $10 billion, which he correctly deduces is a prohibitive amount if we want to actually colonize another planet.
Getting that cost down to the median price of a house — around $200,000 — is key to making the Mars plan viable, says Musk. And he outlines four essential steps that will need to be taken if there’s any hope of doing that. First, the transportation would have to be fully reusable because any amount of waste would significantly
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