For the first time ever, astronomers have identified molecular oxygen in a galaxy outside the Milky Way, Markarian 231, which contains 100 times as much oxygen as our own galaxy..
In the search for a molecular oxygen cloud, astronomers first looked to see if they could spot a cluster of stars which held a gas cloud. They were unable to make contact with any molecular oxygen.
On a different hunt, a radio survey was launched to observe an extragalactic region where the molecular oxygen cloud appeared to be gravitationally bound to the galaxy in one or more intergalactic regions. Results from these observations suggested a molecular oxygen cloud, but only at a relatively small fraction (less than about 3%) of the distance between our Milky Way and this galaxy.
In March of 2012, a team of astronomers were now able to observe a molecular oxygen cloud which had been gravitationally bound when they launched the Wide-field Infrared Survey Explorer, or WISE. This latest study found almost 10 times as much oxygen as before and the galaxy showed no signs of binding to any nearby molecular clouds.
Bottom line: WISE observations of a molecular of O 2 in the galactic core, the galactic core, showed it to be 10 times more oxygen than before. [Read more] [See a PDF of this article Here