I know that the term 'even horizon' was made popular in various movies about black holes etc. but here's the first definition that comes up on a search:
en.wikipedia.org...
In general relativity, an event horizon is a boundary in spacetime beyond which events cannot affect an outside observer.
Astronomical anomalies can always suggest, among other explanations, a new object. They always have.
As far as the horns - OP said he saw them using google sky when selecting infra-red. I don't know that much about how google sky comes up with their sky and if it's pasted together from old plates - don't know. I'm completely unfamiliar with any well-known horned plate artifact. Intrigued though - on both counts.
