Elusive ‘Buchdahl stars’ are black holes without event horizons. But do they really exist?

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An elusive object in space has posed a riddle for scientists. It looks like a black hole. It acts like a black hole. It may even smell like a black hole. But it has one crucial difference: It has no event horizon, meaning that you can escape its gravitational clutches if you try hard enough.

It’s called a Buchdahl star, and it is the densest object that can exist in the universe without becoming a black hole itself. 

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