Rare Noctilucent Clouds Return for Summer Skywatching
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Rare Noctilucent Clouds Return for Summer Skywatching

What's Happening? Noctilucent clouds, one of the sky's rarest phenomena, have returned for the summer season. These clouds, which form at high altitudes in the mesosphere, are visible in the northern hemisphere from mid-May to mid-August. They are best observed at latitudes between 45 and 80 degrees
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