Ars Technica has a great look at just how often serendipity plays a part in major astronomy advances
. From Galileo to the accidental discovery of cosmic microwaves, it seems that it is still better to be lucky than good. "But what's stunning is a catalog of just how common this sort of event has been. Herschell was looking for faint stars when he happened across the planet Uranus, while Piazi was simply creating a star catalog when he observed the object that turned out to be the first asteroid to ever be described, Ceres I."