Astronomers have reported the discovery of an unlikely rainbow in the Solar System, showing that whenever there’s a bit of precipitation and light, rainbows appear. The celestial rainbow appears above Enceladus, the icy moon of Saturn, which is responsible for the formation of Saturn’s E ring. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Enceladus is an active icy moon. When the international Cassini mission studied Saturn and its moons, it revealed that the diminutive Enceladus has a deep liquid ocean, with interesting chemistry that makes the moon a prime target for possible life. Enceladus has geysers on its southern pole, and the icy material they release ends up forming a wide and thick ring.

Researchers led by Niels Rubbrec

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