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July 31, 2022

Noctilucent clouds, Lithuania

© ljphoto7/Getty Image

Noctilucent clouds

It’s around this time of year when some lucky people get to witness these rare, wonderous clouds. Known as noctilucent, or “night shining”, clouds, they’re the highest clouds in our sky and are only visible during summer. They’re made up of icy dust glowing at the edge of space, roughly 80 kilometres above the planet’s surface. To see them, gaze up into the sky at twilight, when the sun has already set on the Earth’s surface, but the high-altitude noctilucent cloud is still in sunlight. These clouds occur almost exclusively at high latitudes, roughly between about 50° and 70° North or South.

Generally colourless or light blue, noctilucent clouds have distinct patterns. It’s not fully known why they happen, though some recent studies suggest methane levels could contribute to atmospheric water vapour that rises high into the mesosphere where they form. What is known is that they were first observed in 1885, making them the newest cloud type.

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