Europa may literally glow green, blue or white on its night side because Jupiter’s radiation energises salts frozen into its surface, and the colour of that glow could offer a new clue to what its hidden ocean is made of

A laboratory experiment found that Europa-like salty ice emits different visible glows under high-energy electrons, offering a possible new way to map the moon's surface chemistry in darkness. The post Europa may literally glow green, blue or white on its nig…