Comets Lay Siege Around Nearby Star Systems: These new observations hold a special relevance to the origins of planetary oceans, and by extension, the habitability of Earth and the potential habitability of exoplanets. The absence of large Saturn- to Jupiter-mass worlds means that these star systems likely avoided the heavy bombardment of comets the inner solar system received and, instead, are experiencing a steady rain of comets. The comets of Gliese 581 and 61 Virginis are in it for the long-haul, laying siege.

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