And what do we still have left to learn?
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10 Deep Lessons From Our First Image Of A Black Hole's Event Horizon
Explainer: black holes
What would happen if you fell into a black hole? Would you see the outside world move backward or forward in time relative to your point of view inside the event horizon?
Event Horizon Telescope – Starts With A Bang! – Medium
Physicists identify what lies behind a black hole's event horizon
This is the oldest black hole ever found — and it's huge
Black hole, Definition, Formation, Types, Pictures, & Facts