So, how do we ever “see” a black hole, even when they are basically invisible?
In this 1-minute long video, Brian Greene explains how we are able to locate a black hole.
He explains by giving the example of a black hole at the center of a galaxy, where the stars are seen whipping around it. The black hole itself remains invisible, but it’s the reason why these stars get this much velocity.
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The existence of a black hole is confirmed at the center of galaxies as it’s the only object that has such massive gravitational pull. Therefore, we believe that a black hole exists at the center of our galaxy with stars rotating around it.
Watch the video below:
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