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quote:Originally posted by Larry Burford
...the 53 AU distance, based on observational evidence that can be interpreted as something like a refraction event at that distance.
I agree. As you say, it's "something like" refraction, but not refraction in the usual sense. The distance is defined by the cluster of unexplained apparent speed variations of Pioneer 10 according to JD Anderson's article which was cited in my 2002 "Aircraft Engineering & Aerospace Technology" article.