Do teachers still write “Check your work!” on tests and homework papers?
I’d start there.
“Do teachers still write “Check your work!” on tests and homework papers?”
They should start with this sentence in the article:
Thus, for every 10,000 solar masses attributed to stars in a galaxy, there is around one solar mass of a central supermassive black hole.
I think they are saying that that central supermassive black holes are huge but the sentence seem to say they are impossibly too small.