Astronomers discovery a graveyard for comets

[unable to retrieve full-text content]Astronomers have discovered a graveyard of comets. The researchers describe how some of these objects, inactive for millions of years, have returned to life leading them to name the group the ?Lazarus comets?.

Source: http://feeds.sciencedaily.com/~r/sciencedaily/space_time/astronomy/~3/v-eo6TLocvs/130802080248.htm

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