Mars sun halo seen by Perseverance rover was thought to be impossible

NASA’s Perseverance rover has spotted a phenomenon scientists had lost hope of ever seeing on Mars.

On Earth, when conditions are just right, ice crystals in the atmosphere can warp sunlight to create the appearance of a bright spot on either side of the sun, or of a halo ringing it. And scientists have long thought that a similar optical trick could occur on other planets as well. But despite decades of robotic explorers on the surface of Mars capturing countless thousands of photographs of the skies, scientists hadn’t seen any sign of a sun halo.

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