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We're lucky that the Impactor's trajectory can be adjusted slightly en route to the comet (astronomers have been refining the comet's position in recent weeks to improve the positioning of the impactor).
I'm just glad that we're this close. Three years ago, a probe (CONTOUR) was launched that would have flown by a few comets. Unfortunately, it broke up shortly after it left Earth orbit. So far, so good, with this one.
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