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NASA scientists are baffled by bizarre spheres on Mars

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New images captured by NASA 's Perseverance rover this month show an alien-like mass comprised of hundreds of the millimeter-sized spheres.

Scientists are unsure what 'quirk of geology' could've made the strange shapes, which are unlike anything they've seen before.

They could hint at the rich volcanic and geologic history of the Red Planet , which is 4.6 billion years old .