Comet Lulin is now approaching earth. This beautiful comet is unusual in a couple of different respects. For one thing, its color is greenish due to the cyanogen (CN) and diatomic carbon (C2) it contains. And for another, it is approaching the sun "backwards" and is expected to leave the solar system once it swings around the sun. The comet has never yet been close to the sun, so that it retains many of its original gases.There's also a neat story behind its discovery by a Chinese teen. See here for more.
Cross-posted with Unity of Truth.
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