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An Early Start for Noctilucent Clouds - HD

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An Early Start for Noctilucent Clouds - HD

M
Michael500ca

176 Views • Jun 12, 2013

Description

These high-altitude clouds are sometimes created by water molecules freezing around 'meteor smoke' in summer months. Best viewed at high latitudes but sightings have occurred as far south as Nebraska and Colorado.

Credit: NASA