To Infinity & Beyond
Elon Musk thinks that if humans are a multi-planetary species, we have a better chance of long-term survival. In order to colonize Mars, a ticket should cost less than $200,000. This will require: 1) Full reusability of rockets. 2) Refueling in orbit. The only way to move enough supplies to Mars is, going in stages and refueling the spacecraft in Earth orbit before it sets off to the Red Planet. 3) Making propellant on Mars. The only way to reuse the spacecraft is by sending it back to Earth. 4) Using the right propellant. Musk says that only a methane-based fuel could be produced on Mars and used efficiently. Get the full story along with fun cartoons and a cool video at Wait But Why (22 minutes).