Ghostly circles in the sky can’t be explained. And astronomers are excited.

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In September 2019, my colleague Anna Kapinska gave a presentation showing interesting objects she’d uncovered when searching our new radio astronomical data. She had started off noticing very odd styles she could not fit effortlessly to any identified form of object. Among them, labeled by Anna as WTF?, was a image of…

News: Ghostly circles in the sky can’t be explained. And astronomers are excited.

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