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Uranus and Neptune are non-identical twins – now we know why

Observations have revealed why the two planets – the same in almost every way – are different colours.

uranus-and-neptune
NASA’s Voyager 2 spacecraft captured these views of Uranus (on the left) and Neptune (on the right) during its flybys of the planets in the 1980s. Credit: NASA/JPL-Caltech/B. Jónsson.
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