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Do you know why there are black holes in space? Are there any undiscovered plants [sic?] in space?
Black holes aren’t really holes in space, exactly. You might think of them as like really really really really heavy planets. Like, when a big star gets old, it can collapse on itself, getting small, but still having the same mass. (It’s like if you were to squish a marshmallow down into a little lump. It’d take up less space, but it would still weigh the same.) Even though they’re smaller, black holes still have lots of gravity—so much gravity, that they even pull light down towards them. So they look totally black.