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Building Blocks Of Life Found In Comet For The First Time

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For the first time, a building block of proteins -- and hence of life as we know it -- has been found in a comet.

That adds to the prevailing notion that many of the ingredients for the origin of life showered down on the early Earth when asteroids (interplanetary rocks orbiting the inner solar system) and comets (dirty ice balls that generally congregate in the outer solar system beyond Neptune) made impact with the planet.

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