Have you ever seen a rainbow at night? Moonbows are as cool as they are rare. They occur when the light gets refracted through water droplets in the air, just like it happens when a normal rainbow forms. But the source of light, in this case, is different. If you want to witness a moonbow, opt for a night when the Moon is at its fullest, for example, during a full Moon phase. But it's not the only rare natural phenomenon you can spot.

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