Mysterious Green Comet Nears Earth, Revealing Secrets of Time and Space
The new comet that's appeared in the night sky between the Big and Little Dippers is no visual extravaganza. To the unaided eye, it's just a small, green-tinged blob—nothing like Halley's Comet of 1910, whose tail stretched two-thirds of the way across the sky. And it will pass quickly, fading…
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