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What’s inside a black hole?

Theoretical physicists have thought long and hard about what goes on inside black holes and their conclusions are mind-bending to say the least. Despite the fact that they suck in material from anything and everything that strays too close, they are empty. The mass of a black hole is confined to an infinitely small point at its centre, called a singularity.

How much blackness surrounds a singularity – in effect, the size of the black hole – is defined by the strength of its gravitational pull. Far away from a black hole, light can zip around as usual, lighting up the heavens as it goes. But closer to a black hole, gravity becomes stronger and stronger until eventually, not even light can move fast enough to escape its pull. This is why a singularity is surrounded by a vast sphere of darkness. The point at which the hole’s gravity becomes strong enough to prevent light escaping is known as the event horizon.

“To know what’s inside a black hole, we need something to come out from behind the event horizon, and reach us via a telescope. The easiest thing for astronomers would be light, but a black hole is so massive not even light can escape so no information can get out,” he said. “You could go and look, but once you’re in you never come back out again.”

(Source: Guardian)