Earth's highest, coldest, rarest clouds are back. How to see the eerie 'noctilucent clouds' this summer.

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Look North as the stars appear in June and July to have a chance of seeing rare noctilucent (or 'night-shining') clouds with the naked eye.

Earth's highest, coldest, rarest clouds are back. How to see the eerie 'noctilucent clouds' this summer. : Read more