Astronomers have discovered oxygen and heavy elements in the earliest galaxy ever seen, suggesting some galaxies as early as 300 million years after the Big Bang matured early.

Oxygen discovered in most distant galaxy ever seen: 'It is like finding an adolescent where you would only expect babies'

Source: space
Source Link: https://www.space.com/the-universe/oxygen-discovered-in-most-distant-galaxy-ever-seen-it-is-like-finding-an-adolescent-where-you-would-only-expect-babies