With bright twilight now persisting well into the night, observers of the sky should watch out for a particularly beautiful type of cloud formation seen only at this time of year.
Known as Noctilucent cloud, these delicate formations appear above the northern horizon, long after sunset, often around midnight. Shining quite brightly, Noctilucent cloud is filamentary in structure, having a characteristic silvery-blue colour... [Read more about Noctilucent cloud]
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