lunar missions

Since they were discovered in 2019, strange, glowing circles of light in space have mystified researchers. Now called odd radio circles, or ORCs, these rings of light sit in the radio portion of the electromagnetic spectrum. They pulse out of the centers of some galaxies – and until now, no one knew why.

In this episode, host Regina G. Barber talks to Alison Coil, a professor of astronomy and astrophysics at University of California San Diego, about her latest research. They break down what ORCs are, where they come from and what they might reveal about how galaxies evolve over billions of years.

Wondering about other happenings across the universe? Email us at shortwave@npr.org – we'd love to hear about it!

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In all our searching of the universe, we’ve never seen another moon like ours. It's big, it's weird, and it has played a huge role in shaping our planet. But how did we get it? Every possible story points to cataclysm. This episode originally ran on June 15, 2022. It is part of our Lost Worlds series exploring scientific mysteries buried in the deep past. For more, go to http://vox.com/unexplainable It’s a great place to view show transcripts and read more about the topics on our show. Also, email us! unexplainable@vox.com We read every email. Support Unexplainable by making a financial contribution to Vox! bit.ly/givepodcasts Learn more about your ad choices. Visit podcastchoices.com/adchoices