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@isaackuo @spaceflight @nyrath This really bugged me when I read it. I'm no kind of expert, but fusion happens in space not because of vacuum, but because of HUGE FREAKING GRAVITY WELLS. Making fusion happen on earth is not the hard part -- witness Philo Farnsworth's Fusor and/or fusion bombs -- it's making it happen in a controlled, break-even, energy harvestable way that's hard. Which will also be hard in orbit...