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The Universe Could Be Filled With Ultralight Black Holes That Can't Die
Steven Hawking famously calculated that black holes should evaporate, converting into particles and energy over vast periods. But what if the evaporation process stops at the Planck scale? A new paper suggests that primordial black holes that formed early in the Universe could still be around, unable to evaporate fully. They would continue roaming the Universe as cosmic relics, occasionally accreting matter and evaporating again.
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