'WTF?': Newly Discovered Ghostly Circles in the Sky Can't Be Explained by Current Theories, and Astronomers Are Excited

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, labeled by Anna as WTF?, was a picture of a ghostly circle of radio […]