Some of you might know that comets are like big dirty ice balls travelling in space. When approaching the sun, the water evaporates, and leaves a tail behind the comet.
For a long time, astrophysicists have thought that water on Earth is there due to a large quantity of comets crashing on Earth's surface during its formation.
The now famous "Rosetta" experiment seems to tell an entirely new story !!
http://www.theguardian.com/…/…/water-comet-67p-earth-rosetta
T.
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