How astrophysicists find black holes by Neil deGrasse Tyson #shorts #space #science

Neil deGrasse Tyson explains how astrophysicists can observe black holes in space indirectly.

The gravitational pull of black holes is revealed by the mass and speed of a planet or star orbiting it.

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If the sun had more mass instantly, that speed is not enough to maintain our orbit and we’ll start spiraling in towards it.

If the sun had less mass, that speed is too high to be in this orbit.

It’ll take it to a… sorry…

it’s too fast to maintain this orbit.

It’ll climb us out to a higher orbit, slow us down, and we’ll be in a higher orbit with a slower speed.

So in other words, for any object at any distance, there’s only one speed you can maintain and have a stable orbit around it.

So when we see stars orbiting something in the center of the galaxy, it is a straightforward Astro 102 (lesson) equation to calculate how much mass the thing is orbiting and you get the mass and you can’t see it.

It’s small.

It’s a black hole.

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