Matthew MacKenzie, member 42913, spotted this article on the BBC News website.

In 1892 Edvard Munch painted The Scream and in the background the sky in full of colourful wavy lines. Scientists from Norway have theorised that these are probably Mother of Pearl or Nacreous clouds. These clouds are usually spotted two hours after sunset or just before sunrise and are extremely bright with vivid, shifting iridescent colours.

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