SpaceX
CEO Elon Musk was a guest in Sunday's episode of The Simpsons , and a jab from
Lisa, who says that for a man who likes electric cars he sure burns a lot of
rocket fuel, seems to have hit the right note, compelling real-life Musk to give
the world a quick rocketry lesson on Twitter. Yes, it's coming from a cartoon
character, but it's an interesting remark — Elon Musk is also CEO of electric
car company Tesla, trying his hardest to prove that gas-guzzling cars are the
stuff of the past. Yet, SpaceX's Falcon 9 rocket's nine engines burn tens of
thousands of gallons of kerosene per launch. There's a good reason why SpaceX is
not trying to build an electric rocket, however — according to Musk, it simply
cannot be used to reach Earth's orbit. Musk twitted: "Follow Reason is
Newton's Third Law. In vacuum, there is nothing to "push" against. You must
react against ejected mass."
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