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How Do We Know Black Holes Exist?

You’ve probably heard about black hole as a space-time region that exhibits such strong gravitational pull that no particle and radiation can escape from inside it. So, if nothing can escape a black hole, how could we observe them? And, how do we know they exist?

THIS IS COOL. I WANT TO LEARN SOMETHING ELSE, TOO!

Video via – Minute Physics
Further Readings And References: Stellar Collapse, University of IllinoisNorthwestern University

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