They can be everything from the leftovers of a supernova, a planetary nebular, or looking at something such a proto-planetary disc or star-forming galaxy from a certain angle.
They can also be a sign of a bug and may come about when there are bright sources from incorrectly-calibrated telescopes.
However, the newly discovered circles do not appear to be explained by any of those more traditional objects.
Instead, the researchers note, they "appear to be a new class of astronomical object".
https://news.google.com/__i/rss/rd/articles/CBMiZmh0dHBzOi8vd3d3LmV4cHJlc3MuY28udWsvbmV3cy9zY2llbmNlLzEzMDgxMTIvc3BhY2UtbXlzdGVyeS1hc3Ryb25vbWVycy1kaXNjb3Zlci1hc3Ryb25vbWljYWwtb2JqZWN0c9IBamh0dHBzOi8vd3d3LmV4cHJlc3MuY28udWsvbmV3cy9zY2llbmNlLzEzMDgxMTIvc3BhY2UtbXlzdGVyeS1hc3Ryb25vbWVycy1kaXNjb3Zlci1hc3Ryb25vbWljYWwtb2JqZWN0cy9hbXA?oc=5
2020-07-12 07:00:00Z
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