The moon has a tail
The tail is invisible to the naked eye but appears on all-sky cameras during every new moon. Like a comet soaring through the cosmos, the moon is followed by a slender tail of irradiated matter — and Earth passes directly through it once a month. The lunar tail is harmless and invisible to the naked eye. During those few new-moon days each month, however, the beam becomes visible to high-powered telescopes that can detect the faint orange glow of sodium in the sky.
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