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The Comet Hartley 2 Cruise

In early November of last year, Comet Hartley 2 became the fifth comet imaged close-up by a spacecraft from Earth. Hartley 2 is making astronomical headlines again. New Herschel Space Observatory measurements indicate that the water in this comet's thin atmosphere has the same ratio of the hydrogen isotope deuterium as Earth's oceans. This suggests Hartley 2 originated in the Kuiper Belt.