Comet Lulin: A must see for comet watchers, and more

A green comet that seems to fly backwards will visit the solar system next week.

Comet Lulin: A must see for comet watchers

An odd celestial voyager will visit the solar system next week—a green comet that seems to fly backwards. Comet Lulin, named for the Taiwan observatory that discovered it, is on track to approach to within 38 million miles of Earth on Feb. 23. Through binoculars or a small telescope, observers can see its green tinge, caused by sunlight illuminating two of its components, cyanogen and diatomic carbon. Rare among comets, Lulin circles the sun clockwise—the opposite direction of the planets—and because of an optical illusion, its tail will appear to be in front of its nucleus. “If you are interested in comets,” said NASA astronomer Stephen Edberg, “make sure you see it.”

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