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1320Fastback t1_j0cc206 wrote

eli5 how these were not seen by airplanes, satellite or other ways until now?

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uhhhhhhhyeah t1_j0dq30f wrote

Some are “faded” and damaged, some are in places they weren’t expecting, like sides of hills instead of desert floor. If you get PBS, Nova has a recent special out about it. The science involved in finding them is really cool.

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