Tucson, Ariz.

The comet Pan-STARRS splits the gap between two cacti on the night of March 14, 2013. (Facebook/Pete Gregoire)

Twilight on Tuesday provided the best photo op for the comet called Pan-STARRS. It was visible in the Northern Hemisphere just above the western horizon – right next to the crescent moon.

Last Tuesday, Pan-STARRS made its closest approach ever of Earth. It will be visible in the Northern Hemisphere for weeks to come.

The comet's name is actually an acronym for the telescope in Hawaii used to discover it two years ago: the Panoramic Survey Telescope and Rapid Response System.

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