A cd.
A donut.
A lifesaver.
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A bucket for carrying water.
A ditchand a trench?
A puncture.
No. Once something enters a black hole it is trapped forever.
black hole got it's name because when look at a black hole, you only see black. also if you drop an item in the black hole the item is gone because there is a hole in there. so that's how black hole get's its name