Astronomers watch a black hole's corona disappear, then reappear

This kinda reminds of when watching a flame from a a gas source, sometimes where the bottom of the flame starts shifts up and down.

If you have a pressure cooker at home, boil some chickpeas for a couple of whistles, wait 3 minutes, take the cover off, put it back on the stove and stir fast.

You will see all the steam doing the dance and shooting out like you'd expect from a black hole.

I'm not sure if only spinning Black Holes have a corona or even static ones do, that may be an interesting point to ponder.

The chickpeas stew is yum as well after (1 part chickpeas, two parts water) :)

My guess is the black hole was used for an interstellar gate by an alien ship warping into local space.

Nice introductory TED talk on "How to find black holes" by one of the co-authors: https://www.youtube.com/watch?v=Idsj47D719E

So 2nd wave of corona?

Hehehe