These ghostly circles in the sky came out of nowhere ...Middle East

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These ghostly circles in the sky came out of nowhere
You might not notice these mysterious celestial imprints with bare eyes, but they're out there. (Rad Pozniakov/Unsplash /)Ray Norris is a professor at the School of Science at Western Sydney University. This story originally featured on The Conversation.In September 2019, my colleague Anna Kapinska gave a presentation showing interesting objects she’d found while browsing our new radio astronomical data. She had started noticing very weird shapes she couldn’t fit easily to any known type of object.Among them, labelled by Anna as WTF?, was a picture of a ghostly circle of radio emission, hanging out in space like a cosmic smoke-ring. None of us had ever seen anything like it before, and we h

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