Mars solar halo seen by Perseverance rover was thought impossible

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

On Earth, when conditions are just right, ice crystals in the atmosphere can distort sunlight to create the appearance of a bright spot on either side of the planet. Sun, or of a halo ringing 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 Mars taking countless thousands of pictures of the sky, scientists hadn’t seen any sign of a solar halo.


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