Rosetta’s wrong water could be right after all – New Scientist

Rosetta miasion analysis suggests, “Comet 67P’s water isn’t like Earth’s – it’s interstellar stuff, from the same mould as the pristine material that made the solar system.”
This article offers a snapshot of current theories about where the Earth got its water, based increasingly on the ongoing missions to Ceres and 67P. The mystery could make for an interesting class discussion and writing project, as well as providing a head-spinning example of how the Earth has changed over time. What else might the lander find?

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