Hubble Space Telescope observations of comet 103P/Hartley 2, taken on September 25 (imge by NASA)
A recent discovery may add support to the theory that the water on Earth was brought by a rain of comets. Scientists have analyzed the comet Hartley 2, and discovered that ice found on it has the same composition as ocean water. The discovery was made utilizing an orbiting telescope on the Herschel Space Observatory, which can observe organic molecules by reading their far-infrared wavelengths.
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