Noctilucent Clouds (NLCs) are Earth's highest clouds, that float at the edge of space more than 82 km (50 miles) above the planet's surface. When viewed from space, the same atmospheric phenomenon is referred to as polar mesospheric clouds (PMCs). Noctilucent clouds appear during summer and are probably composed of tiny ice crystals and specks of meteor dust.

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Science @ NASA science.nasa.gov
Semen Sh. - NLC 2015.06.23 Timelapse 4K
Noctilucent cloud (серебристые облака) over Bryansk, RU

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