Astronomical Data Analysis Software and Systems IV ASP Conference Series, Vol. ... Our primary finding is that the program we used, AutoClass, was able to form seve­ ral sensible categories from a few simple attributes of the object images, separating the data into four recognizable and astronomically meaningful classes: stars, galaxies with bright central cores, galaxies without bright cores, and stars with a visible ``fuzz'' around them. ... Weir, N., Djorgovski, S., & Fayyad, U. 1995. ...