A fusion-powered rocket to detect lethal comets

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Really big space rocks (a mile or wider across) crash into Earth about once every 500,000 years. That’s rare, but we might not spot the next one until it’s too late for existing technology to stop it—especially if it’s a comet. Because comets can travel twice as fast as an asteroid, we’d need something 20 times more powerful than anything in our arsenal to fend it off. What’s humanity to do? Continue reading “A fusion-powered rocket to detect lethal comets”

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