Ask Ethan: Could our whole Universe be a black hole's interior?
Briefly

Black holes are mysterious astronomical entities marked by event horizons that prevent observation of their interiors. Inside these black holes is theorized to lie a singularity, which is a point where the laws of physics cease to function normally. The emergence of our Universe itself could stem from a singularity, setting off cosmic inflation that led to the Big Bang. Some theories suggest a possible link between black holes and our Universe as a singularity within a larger universe, raising intriguing questions about their relationship.
Black holes represent some of the most mysterious objects in our Universe, with their interiors inaccessible due to event horizons, which separate our observable Universe from what lies beyond.
Each black hole is theorized to contain a singularity, a region where the laws of physics break down, and where space and time cease to exist.
Read at Big Think
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