NASA’s Webb telescope uncovers mysterious "little red dots," pointing to the existence and growth of supermassive black holes ...

This means measuring this ratio at ever-increasing redshifts, since the greater the redshift, the younger the galaxy. For ...

These galaxies, hidden from optical surveys due to their high dust content, have spectroscopic redshifts between 5 and 9, corresponding to a time when the Universe was less than a billion years old.