This story is probably from an anthology. It involves a kid or teenager who is secretly developing a black hole in his room. Eventually things get out of hand.

I believe this was written in English.

  • 9
    "unexpectedly"... May 17 '17 at 19:38
  • 1
    @PlutoThePlanet - What kind of bumbling muppet has the smarts to make a black hole but is unaware of its destructive potential?
    – Valorum
    May 17 '17 at 19:42
  • 1
    @PlutoThePlanet they have quite a bad fame, but they are not that bad
    – SJuan76
    May 17 '17 at 21:01
  • OP comment below doesn't indicate 100% certainty but seems to agree this is likely the same story
    – Otis
    May 19 '17 at 20:43
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    @Otis Should we wait a bit then? Maybe OP will come back after having read the story. May 19 '17 at 21:12

"Bobo's Star" by Glenn Chandler. It's been collected in several places, with Science Fiction Stories being where most have found it as per Trying to identify some short stories and Scifi short story with a star in a jar.

Reviewed here:

This children's story concerns a boy (Bobo) and his science experiment. Somehow he gets his hands on a Star Genesis Kit and creates a "pet" star in a protected, tough glass case, complete with an airlock via which Bobo can scoop sand into the vacuum, "feeding" his star in order to sustain itself. After feeding his star too enthusiastically, it finally undergoes a metamorphosis long after it should have burned out peacefully: it begins to collapse. When this fledgling black hole finally breaks out of its protected case, Bobo's uncle and a tray of tea cakes –along with half of Bobo's room – are the first to be gobbled up; Bobo himself only has time to imagine the headline "BOY DESTROYS UNIVERSE" before he is obliterated too. – Johann Greffrath

  • 2
    Found by searching for short story teenager creates black hole in closet and following the results.
    – FuzzyBoots
    May 17 '17 at 19:55
  • I'm tempted to compare this to Dr. Seuss's A Fish Out Of Water.
    – Spencer
    May 17 '17 at 20:57
  • I think that's it, but none of the links leads to the story itself. May 18 '17 at 2:52
  • @RobertGarner: Nope. It's almost certainly still under copyright, and it does not look like the author has put it out online. Do the details mentioned in the review match up to your memories?
    – FuzzyBoots
    May 18 '17 at 3:31
  • Yes, the details seem pretty similar. I think the boy was trying to be sneaky about it. May 18 '17 at 14:58

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