When’s the next one?!
We cross the galactic current sheet about once every 12,000 years.
The current sheet sweeps up dust and debris like a Swiffer duster. Some small fraction of this dust is bigger than dust; sand, gravel, rocks, boulders, and the occasional really, really big rock.
Most of that crap passes through the Solar system without actually hitting anything. Most, but not all.
About every 12,000 years. The last big chunk to hit earth was about 13,000 years ago. We haven't quite hit the dust storm yet...
When’s the next one?!
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Any fall. The Taurid meteor shower is believer to be the source - from a broken up 100 mile wide comet or from Comet Enike.
Its not a matter of if. Its a matter that will happen at some point. We will go through the debris cloud and, if there are still large mile wide chucks, they will find Earth. And everything will change.