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We have known for a while that asteroid 3200 Phaethon acts like a comet. It brightens and forms a tail when it’s near the Sun, and it is the source of the annual Geminid meteor shower, even though comets are responsible for most meteor showers. Scientists had blamed Phaethon’s comet-like behavior on dust escaping from the asteroid as it’s scorched by the Sun. However, a new study using two NASA solar observatories reveals that Phaethon’s tail is not dusty at all but is actually made of sodium gas.

Qicheng zhangKarl battamsVanessa thomasCalifornia institute of technology phMethod of researchGoddard space flight centerNaval research laboratoryJapan aerospace exploration agencyEuropean space agencyExperiment of space technology for interplanetaryCalifornia instituteTechnology phdPlanetary science journalSolar terrestrial relations observatorySolar probeHeliospheric observatory