A thin layer of ice and complex organic molecules covers the surface the asteroid Themis (the largest of a family of asteroids to which it gives its name), a rocky body200 kilometres in diameter orbiting between Mars and Jupiter. According to an international team of astronomers, the ice particles are uniformly distributed over the entire surface of the asteroid in even greater proportions than the water detected on the Moon. This unexpected discovery, which could explain the development of life on Earth, has been published by the scientific journal Nature. ‘A thin layer of frost covers
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