- What causes "crater chains" or whatever these things are...
RJN wrote:The APOD for 2011 October 24 depicted the Waterfall Nebula, a structure that appears on the sky that is not well understood.
This thread is meant to solicit other such structures on the sky that have been imaged, thought about at least a bit, but no consensus as to its cause has yet been formed. If you know of such a structure, please mention it in a reply to this post. Thanks for contributing, if you can.
Ann wrote:One of my own favorite "weird structures" is a background galaxy that appears in the field of M51 and its companion galaxy, NGC 5195. The galaxy I refer to can be seen in this picture by Adam Block. The galaxy is located "straight below" NGC 5195 in this image. The galaxy looks like a "blue handlebar inside a bubble".
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