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♪
NARRATOR: So, you're looking to find – and watch – some black holes.

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And there are quite a few of them, so you're in for a treat!

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But, before you get to all the fancy ones,
let's first take a look at some of the simplest ones.

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After all, looking at the fancy ones first would be like trying to spot
a Zordorgian Grandlebuss before you even know basic Grandlebuss anatomy,

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and that would just be silly.

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Anyway, your basic, solitary black hole is, 
well, basic ... er, relatively speaking.

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It has a lot of mass, a bit of spin,

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a boundary inside of which everything,
including light, can only fall inward,

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and beyond that, well, um, we actually have no idea.

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However, because solitary black holes are so simple,
they're quite hard to spot.

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But, if you have a keen eye, you might be able to
catch a glimpse of them by looking at their surroundings.

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For example, black holes bend the light traveling past them,

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and you can see this effect – called “lensing” –
around the edge of the black hole.

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There you are!

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Also, because black holes tend to mess with their environments,
you can sometimes find one by using other clues,

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such as a bunch of stuff orbiting what appears to be ... nothing.