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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Beavers return to Detroit River after 75 years

Beavers have returned to the Detroit River for the first time in at least 75 years. Workers at Detroit Edison recently discovered a beaver lodge in an intake canal on the city’s east riverfront, and cameras have caught its furry inhabitants on film. John Hartig of the U.S. Fish and Wildlife Service credited efforts to clean up the river and noted that other species— among them bald eagles, sturgeon, peregrine falcons, and whitefish—also have been coming back to the area. “It’s part of that larger story of ecological recovery. If it’s cleaner for them, it’s cleaner for us, too.”