Myth Debunked: Did Earth get all its water from comets?
An image of Halley’s Comet. Photo: NASA
While it is likely that Earth got a good amount of water, and other materials, from comets, the probable incidence of comet collisions with Earth in its distant past, in a period called the ‘Late Heavy Bombardment’, falls well short of explaining the amount of water that we find on our planet.In fact, Earth’s ocean...