Ou 2 and Ou 5

Auteur(s): Trolligi

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Ou 2 and Ou 5 are two planetary nebulae which names both start with Ou (obviously). Ou 2 is about 4,900 light years away in Cassiopeia, while Ou 5 is about 10,100 light years away in Cygnus (I think). Ou 2 is a conventional planetary nebula while Ou 5 was actually formed from binary interactions involving a small red giant. The colours of the planetary nebulae are mostly guesses.

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