Elon Musk deny possibilty of electric space rocket

Last night when Elon Musk appeared on the Simpsons and talked about his Dragon Spacecraft, Lisa points that for a man who likes electric cars he sure burns a lot of rocket fuel.

Elon Musk later twitted about it describing that it is not possible to get rocket out of the earth using electric energy.

‏@elonmusk

If u saw @TheSimpsons and wonder why @SpaceX doesn't use an electric rocket to reach orbit, it is cuz that is impossible

Musk continued on tweeting "Reason is Newton's Third Law. In vacuum, there is nothing to "push" against. You must react against ejected mass … Ion thrusters are great, but have extremely tiny force (photon thruster even less). Must have more thrust than weight or you don't go up."
He further tweeted

‏@elonmusk

And pls don't ask me about space elevators  until someone at least builds a carbon nanotube structure longer than a footbridge.

‏@elonmusk

Final one: anything launched by a railgun (if you could ever reach ~ Mach 27) would explode upon exiting the barrel in our dense atmosphere

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