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[–] BananaBro 0 points 2 points (+2|-0) ago 

They're at centre of most large galaxies!

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[–] schwanstucker 2 points 2 points (+4|-2) ago 

Interesting. That's why, if you wake up in the middle of the night when it's quiet, you'll no doubt hear a tiny sound like a vacuum cleaner.

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[–] Numzane [S] 0 points 2 points (+2|-0) ago 

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[–] Ilvi 0 points 1 point (+1|-0) ago 

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[–] Raverdash 1 point 1 point (+2|-1) ago 

Of course, that's why it's dark at night time.