What distinguished the record-breaking JWST discovery regarding an early quenched galaxy's age?

Answer

It had stopped forming stars by the time the universe was only 700 to 800 million years old.

The specific record-breaking discovery involved a remarkably massive galaxy that had already ceased star formation when the universe was only between 700 and 800 million years old.

What distinguished the record-breaking JWST discovery regarding an early quenched galaxy's age?
Spacegalaxiesastronomycosmologydead galaxies