The M87 Black Hole in Context

Last week we looked at the amazing news that astronomers had finally photographed a black hole. Or, technically, the shadow of a black hole since the black hole itself cannot be seen. I want to return to that news, because it’s awesome. And because xkcd published a piece that annotated the image to show the size of things by comparison.

I had mentioned that it was a supermassive black hole, some of the biggest of the bigs. And M87 is a beast.

Voyager 1 is barely at the event horizon…
Voyager 1 is barely at the event horizon…

Credit for the piece goes to Randall Munroe.

Blackholes and Revelations

On Sunday night I went to see the English rock band Muse perform here in Philadelphia. The concert was to support their latest album, but of course they played Starlight, a song which gave us its respective album’s title: Blackholes and Revelations.

Then on Wednesday, scientists announced that for the very first time, we have actually been able to take a photograph of a blackhole. This one is a supermassive black hole at the heart of the M87 galaxy, some 500 million trillion kilometres distant.

Hopes and expectations?
Hopes and expectations?

The bright light, or ring of fire, is the heated gas before falling beneath the event horizon, which here is the black disk. Beyond that point, the gravitational force is so strong that not even light can escape. And of course without light escaping to be seen, a black hole cannot be directly imaged. Instead, we have to look for its accretion disc.

It’s just cool.

Credit for the piece goes to the Event Horizon Telescope Collaboration.