Scientists estimate between 40,000 and 60,000 tonnes of meteorites and other cosmic debris land on Earth each year. About four billion years ago, during the period of the "heavy bombardment" of the early Earth, the amount would have been much higher. Scientists study meteorites to understand the evolution of the solar system, but these lumps of space rock may also tell them something about the origin of life here on Earth, and possibly on other planets.
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Erda: The Story Of Earth
Historical FictionThe known and unknown story of Earth and how life evovled in it and elsewhere
