It has been quite a year for astronomy and another discovery that is changing previous models has to do with comet 67p.  Apparently the discovery of oxygen took a lot of people by surprise:

The Rosetta spacecraft has discovered molecular oxygen in the cloud of gas surrounding the comet it is tracking.

The discovery has come as a complete surprise to scientists who thought that oxygen would have reacted with other elements as planets were forming.

Let’s find out the implications of this discovery on page 2

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