Eli5: How do blackholes form and exist?

Question

Eli5: How do blackholes form and exist?

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Answer 1

Mass warps space/time.

Gather enough mass and the warping of space/time becomes so great and so pervasive that nothing, not even light can escape.

So, the singularity itself can’t be observed, but many of them have what’s called an accretion disk that surrounds the black hole and marks the boundary where its gravity becomes so strong that nothing can escape. This disk usually glows with the heat and energy of the falling matter being torn apart.