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Its gotta make you wonder what else there is out there that we can't see !
(Ie: 'dark' gases etc).
They're saying this was spotted simply because the quasar jets illuminated one part of one of the galaxy's trailing arms of gas, about one million years ago. (The jet then stopped less than about 200,000 years ago).
There has to be a lot of dark cold gases floating out there. (And thus, plenty of exotic gravitational fields as well).
Thanks Rolf !
Cheers
PS: Interesting that its Oxygen as well !! Hmm ..
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