Some time ago, I was sitting at a family gathering when my grandmother asked me: “What is a black hole?”. I was in my second year of the astronomy bachelor’s in Chile, the first-ever image of the M87 black hole had just been made public by the Event Horizon Telescope and it was all over international news. I noticed that other people around me stopped their conversations and started listening to my response: “Well, you know how the Earth has gravity we can’t escape? That’s how we stay on the earth instead of flying into space. A black hole has such strong gravity that light cannot escape. Therefore, it’s a…
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