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You can’t have life without water, so how did water arrive on arid Earth?
The answer may lie with comets. In our planet’s early history it was bombarded by billions of tonnes of space debris, including comets. This is called the “Late Heavy Bombardment”. For 200 million years comets and asteroids travelling at over 23,000mph crashed into the Earth. The planet was a scolding cauldron of molten rock with temperatures almost 2,000 degrees, no life could survive in such an inhospitable place.
Clip taken from the Naked Science documentary “Comets”.
Watch it here – Coming soon!