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New measurements of Mercury's yellow-orange tail, which streams in the solar wind like the long tail of a kite, put it at more than 100 times the radius of the planet itself.
The neutral sodium atoms that make up the 2.5 million kilometre-long streamer are thought to be blasted off the surface by the sun and micro-meteor impacts. These impart enough energy to launch the atoms into space.
Other elements are also in the tail. But it's the sodium that lights up and can be detected.