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This article reports on the observation that dark comets may still be zipping around the solar system. According to astronomers Bill Napier at Cardiff University in Wales and David Asher at Armagh Observatory in Northern Ireland, the rate that bright comets enter the solar system implies there should be around 3,000 of them buzzing around, and yet only 25 are known. Dark comets occur when an active comet's reflective water ice has evaporated away.