NASA's orbital-trajectory designers, will arrive at its target, comet Tempel-1, on July 4th.

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If the intercepting missile is ground-launched, it must have extremely high acceleration (15 to 30g over a one-minute period) so as to arrive at the target before burnout.

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That fleeting pulse, a 20-nanosecond flash, can't arrive at once or the tiny round target will warp, making ignition impossible.

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Even if the target moves, so long as the feedback loop is intact, you will arrive at the intended destination.

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