artistic impression shows the irregular surface of the comet Wild 2 where you see 2 jets or jets emission of gases into space with speeds of several hundred kilometers per hour. A team of scientists from the University of Arizona are now evidence indicating the existence of liquid water at some point in their history. The discovery of minerals that require contact with "liquid water" for their training, challenges the paradigm of comets as "dirty snowballs" that never reaches the temperature sufficient to liquefy water ice present. Source
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