How to Watch the ‘Green Comet’ in Night Skies

“They’re alive,” Laurence O’Rourke, an astronomer with the European Space Agency, said. “When they’re far from the sun, they’re sleeping, and when they get close to the sun, they wake up.”

“Because each comet is its own living being, you don’t know how it’s going to react until it passes the sun,” Dr. O’Rourke said.

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