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Mt. Etna with the Green Comet.” data-link-reference data-link-target data-syndicationrights=”false” data-imagerights=”other-license” data-hide=”false” data-hidecredit=”false”>

Mt. Etna with the Green Comet.

Mt. Etna with the Green Comet.
Photo: Giuseppe Petricca

The Green Comet, or Comet 45P/Honda-Mrkos-Pajdušáková, is a periodic comet that passes by Earth every five and a half years. Here, it’s seen passing by Mt. Etna in Sicily.