Solar halo on Mars!  This view of the Martian sky spotted by the Perseverance rover was once considered impossible

Solar halo on Mars! This view of the Martian sky spotted by the Perseverance rover was once considered impossible

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

On Earth, when conditions are ideal, ice crystals in the atmosphere can distort sunlight to create the appearance of a bright spot on either side of the Sun, or a halo that surrounds it. And scientists have long thought that a similar optical trick could also occur on other planets. But despite decades of robotic explorers on the surface of March capturing countless thousands of photographs of the sky, scientists had seen no sign of a solar halo.


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