Why is the water found on comet Comet 67P/Churyumov–Gerasimenko so different from Earth water?

ENN
Jan 11, 2015, 8:00 am28 pts
ESA’s Rosetta spacecraft has found the water vapour from its target comet to be significantly different to that found on Earth. The discovery fuels the debate on the origin of our planet’s oceans.The measurements were made in the month following the spacecraft’s arrival at Comet…

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