The Moon Moves into Late Night, Mars Remains, and we Welcome Comet Wirtanen!

(Above: The orbit of comet 40P/Wirtanen crosses the solar system between Jupiter’s and Earth’s orbital distances on a 5.4 year loop. This year, when that comet is near perihelion and at maximum brightness, Earth will be nearby, setting up the potential for a naked-eye comet in our skies.)

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