Oxygen Found On Comet Baffles Scientists

Oxygen found on the 67P comet is forcing scientists to rethink the existing theories on how planets, comets and asteroids are formed.

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(Photo: Handout photo provided by the European Space Agency (ESA) shows the surface of the 67P/Churyumov-Gerasimenko comet as seen from the Philae lander, when the spacecraft reached the comet's surface on 12th November 2014. Credit: ESA via Getty Images)