Rosetta finds oxygen on comet 67P in 'most surprising discovery to date'

Scientists on the Rosetta mission have found oxygen in the gas cloud around comet 67P in what they described as the most surprising discovery about the comet to date. It is the first time that molecular oxygen - the form of the gas we breathe - has been detected on a comet, and points to a gentle birth for comet 67P some time before the formation of the solar system.
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