re: Will Pioneer 10 ever reach Aldebaran?
RE: Comets almost always arrive at perihelium several days in advance with the predicted time. And Halley is now slightly behind its expected location.
I think that a lot/plenty depends on our sun. General relativity has nothing to worry about at the moment. (Astronomy mag. has some articles on that/gen. relativity and string theory have to worry, but I don't agree, imho.)
