Molecular oxygen has been spotted beyond the Milky Way for the first time

The elusive molecule turned up in a quasar more than half a billion light-years from Earth

Quasar Markarian 231

Astronomers finally found molecular oxygen beyond the Milky Way, but they had to look at a galaxy far, far away: the quasar Markarian 231, shown here in an image from the Hubble Space Telescope.

NASA, ESA, the Hubble Heritage Team (STScI/AURA)-ESA/Hubble Collaboration, and A. Evans (UVA/NRAO/Stony Brook Uni.)

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