Interesting! Here's Laura's article on them http://www.cassiopaea.org/cass/Laura-Knight-Jadczyk/article-lkj-16-07-03.htm
I'm sure there was a more recent article on sott that said (and perhaps my memory is faulty here) these rings could be left by overhead cometary explosions....unfortunately I can't find it, so perhaps I'm mistaken?
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.