In the Arctic and Antarctica, PSCs appear anywhere between 15 and 25 kilometers (9.3 and 15.5 miles) in the sky during cold winter conditions. They’re most often invisible, but they can be sighted when the sun is angled just right. In these cases, they’re known as mother-of-pearl clouds, on account of their wild coloration: swirls …
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poles
Why does Earth have magnetic poles?
Earth is unique in the solar system for a number of reasons: It’s the only planet with a breathable oxygen atmosphere, it’s covered in liquid water and it’s the only celestial body (that we know of) to harbor life. An often-overlooked characteristic that makes our planet special, however, is that it’s the only rocky body …