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Answered 2014-06-25 17:23:39

The major problem with a nuclear fusion reactor is that a 50,000,000 degree temperature is needed. No metal vessel can hold that temperature safely for a long period of time.

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None of the planets is a fusion reactor. The sun is a fusion reactor but it is not a planet.

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Which of the following devices is still in the experimental stages?

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An Ark reactor as currently describe in comic is very much like a Nuclear Fuel Cell. Possibly convert energy from Nuclear reaction to power. Possibly a plasma nuclear fusion reactor. I believe in the future it could be made. See the link and compare the similarity of fusion reactor and Ark reactor.

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