Musk said he hopes to eventually send rockets to Mars (see “The Deferred Dreams of Mars”). But he admitted that the cost of space travel needs to come down by a factor of about 10,000If he is successful with his reusable rockets, the cost will have gone down by a factor of 10. Only a thousand more to go!
Actually, if you were to reduce the mass that needs to be lifted, and then transported, you'll save more. Thus, this milestone is just the beginning of what could be done. People will look at the numbers, get discouraged, and say we should quit. That'd be a mistake.
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