Can You Eclipse a Black Hole?

We have data from a black hole being eclipsed out there in another galaxy. Even though black holes are super powerful, you can't just stand in front of them and block their light. There's a really cool galaxy about 60 million light years away. And they were trying to figure out how big this thing was. They got lucky because a big cloud of gas when they already knew and had studied before passed in front of the black hole and eclipsed it.