Rare Green Comet Nishimura Makes Historic Flyby, Won't Return for Centuries

A newly discovered kilometer-sized comet, named Comet Nishimura, is passing through the Northern Hemisphere for the first time in over 400 years. Stargazers should try to catch a glimpse of the comet this week or early next, as it won't return for another 400 years. The comet will come closest to the sun on September 17 before departing the solar system, and although it is visible to the naked eye, binoculars are recommended for better viewing. The comet was discovered by an amateur Japanese astronomer and last visited Earth approximately 430 years ago.