When last week a comet left damage the size of Earth on Jupiter...

I was wondering when Earth gets such a comet. There was another giant
comet (Shoemaker) which impacted into Jupiter in the past. We get
meteors on Earth. The comet came so fast and hit Jupiter, nobody knew
about what it was or where it came from. It was as big as Darth
Vader's death star. Probably most comets in our solarf system are not
even known about as they can't be seen or detected.

Say it would not hit Jupiter, but barely miss it, and Jupiter would
throw it straight toward Earth. We wouldn't see it coming until hours
before impact.Or if such a thing hits the Moon, so much debris would
rise into space that we would get a million of those meteors where
just one killed the dinosaurs.