Riding Home under an Icy and dramatic Sky.

Noctilucent clouds stretch across the Swedish sky, illuminating photographer Ruslan Merzlyakov’s ride home in this dramatic display.
Noctilucent clouds are the highest clouds in the Earth’s atmosphere and form above 61km above the surface.
Thought to be formed of ice crystals, the clouds occasionally become visible at twilight when the Sun is below the horizon and illuminates them.
Source: In pictures: Astronomy Photographer of the Year 2017 – BBC News

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