Quote:
Originally posted by Azred:
Particulate matter in the uppermost reaches of the atmosphere are bombarded by solar wind, ionized particles emitted by the Sun. This causes the particles to absorb and re-emit energy as visible light. Besides, they can also reflect light from the Sun.
These clouds happen after events like massive volcanic eruptions or near-Earth objects exploding near the ground (which throws dust into the upper atmosphere). Noctilucent clouds are why people in London saw a "blue moon" after Krakatoa erupted and why Londoners could read the newspaper at midnight after the 1908 Tunguska Blast.
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