cynar

Things like this are often a protest by the builders against the architect. They spot a problem with the design, try and tell them and get shouted at. They then build it to the design, knowing it’s stupid, so the architect has to swallow the cost of fixing it.

Which app do you use for that?

I’m guessing that the computer randomises the answer list, to limit cheating. The rest writer was likely cursing it too.

The observations are direct. LRDs are thought to be either clusters of stars or a black hole. The spin is such that it is incompatible with a cluster of stars.

The maths is non-trivial, so needs to be confirmed by others.

As for the primordial part. Black holes are thought to form 1 of 2 ways. Slow build up, in the core of a galaxy, or crushed together by the pressures just after the big bang. This object has a galaxy too small, and too young, to explain it’s size by slow growth. This implies that the galaxy formed around the hole, not vice versa.

This all seems pretty direct to me.