Black Holes

Cosmic Microwave Background, NASA image A black hole is an object so dense that nothing, not even light itself, can escape from its gravity. While we can’t see inside a black hole, we can learn a lot about them by observing matter as it falls in towards them, and by using the laws of physics to predict what happens inside them. Are black holes singularities of infinite density? Are they wormholes to other regions of time and space? What would you experience if you fell into a black hole?

I’ll discuss what we know, and don’t know, about all these questions. I’ll also talk about two groundbreaking observations: the 2015 measurement of gravity waves from two colliding black holes, and the 2017 first-ever photograph of a black hole.

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