NASA astronaut Matthew Dominick photographs a crescent moon over so-called noctilucent clouds from the International Space Station on July 4, 2024. Credit: Matthew Dominick / Earth Science and Remote ...
Forming 50 miles above Earth's surface, noctilucent clouds offer a rare glimpse into one of the least-understood layers of the atmosphere. Noctilucent clouds glow above the horizon after sunset. The ...
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