The rare noctilucent clouds (NLCs) will be visible, shortly after sunset, from the northern hemisphere this month and through the next.
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High clouds
NLCs form at high altitudes, about 76 to 85 kilometers above the Earth's surface, close to the top of the mesosphere.
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Peak season
The best time to see NLCs from the northern hemisphere is around the summer solstice in late June till the end of July.
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Observations
Up until 1885, there were no observations of NLCs, per NOAA. NLCs have been more frequently noticed in recent years.
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Tips
Noctilucent clouds appear in electric blue shades across northern skies. These clouds are best observed with the naked eye but binoculars could improve your viewing.