Don't Look Up warns of a possible 'planet-killer' hitting Earth. How likely is that?

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https://i.cbc.ca/1.6282304.1639190226!/fileImage/httpImage/image.JPG_gen/derivatives/16x9_460/don-t-look-up.JPG It’s a scene we’ve seen on screen before: Giant object hurtles toward us, scientists ring alarms, everyone panics. But while it’s a common trope in movies, just how likely is it that we’ll experience an Earth-ending hit from a comet or asteroid in our lifetime?


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