Imagine clouds that shine at night – these are called noctilucent clouds, and they're super cool!
They appear high up in the sky after the sun sets, looking like bright blue wisps in the western sky.
Scientists aren't exactly sure how they form, maybe because of pollution or gases in the air, but they're a mystery!
Look for them during summer evenings; they're a special treat, but you need to be patient to see them all.
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