We already knew that powerful quasars are very efficient at making light. Now we know that black holes in elliptical galaxies are efficient as well. This suggests that being green is a trait that all black holes may have in common.

Kim Weaver

Already Black Efficient Elliptical Holes Knew Light Powerful

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In an environmental sense, the black holes are actually preventing galactic sprawl from taking over the neighborhood.

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There are no black holes in the sense of regimes from which light can't escape to infinity.

— Stephen Hawking

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A black hole is simply the end of space as we know it!

— Thomas Wallace Scherzer

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I've seen children's eyes light up when I tell them about black holes and the Big Bang.

— Brian Greene