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There are two ways blackholes form:

  1. Massive blackholes - these are formed by collapse of stars having more than 3 times the mass of our sun, when the stars die.
  2. Micro blackholes - these could have only formed in the big bang. Their event horizons are roughly the size of a proton and their mass is similar to that of a mountain. Unlike massive blackholes, which last forever, these evaporate then explode giving them a limited lifetime.
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12y ago

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