How to spot the exotic green comet (and what might get in the way)
Science Weekly
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The Green Comet
Comet will come within 27 million miles of Earth. It has a subtle green glow that is coming from molecules of carbon. When these ancient comets fall in from the outer solar system, they've been untouched since 4.6 billion years ago. Every time they get close to the sun, a little bit of those ancient gases gets evaporated into space.
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