Space junk on collision course with the moon

The moon is about to get walloped by 3 tons of space junk, a punch that will carve out a crater that could fit several semitractor-trailers. The leftover rocket will smash into the far side of the moon at 5,800 mph (9,300 kph) on Friday, away from telescopes’ prying eyes. It may take weeks, even months, to confirm the impact through satellite images.

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