by ninman8

what is the big green donut

Posted February 1, 2014 1:10 AM

by ninman8

its so weird

Posted February 1, 2014 1:11 AM

by JeanTate in response to ninman8's comment.

Welcome to Galaxy Zoo, ninman8!

It's a kind of ghost, an imaging artifact, caused by internal reflections in the camera/telescope, likely of a very bright star somewhere else in the field of view of the camera (or just off it). As planetaryscience says, in the comments, it's discussed in an earlier thread here.

Happy hunting! 😃

Posted February 1, 2014 3:10 AM