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Forget Dark Matter - beware of Dark Comets! Ever since the Mariner 4 Mars fly-by craft was battered by a severe meteor storm in 1967, it was a mystery where the meteors came from.
Now NASA thinks they have found the culprit - a "dark comet" (a broken up normal comet). Read more in this NASA link.
These things pose hazards to NASA's planned Mars exploration by astronauts.
I wonder what the odds would be of a spaceship running into comet debris. The debris still moves in it's orginal orbit, so the odds have to be low.
It is very likely to be a joke.
Dark matter can never be so small to be called a comet. Anti-matter comet is perhaps more dangerous. We really do not have much experience with heavy antimatter atoms and molecules. Just electrons and positrons are enough to create problem.
You will either have it as big mass as sun or greater than sun.
That means your sun will be eaten away so we may become comet along with earth.
This can't happen overnight as first formation is binary star and then only death of star.
You will come to know million years ahead. Does that remove some fear?
Hitting earth with rather few km comets is more dangerous. Both USA and USSR can make their artificial comets of this size so be careful and question them more often.