astronomical telescope - any telescope designed to collect and record electromagnetic radiation from cosmic sources

eyepiece, ocular - combination of lenses at the viewing end of optical instruments

object glass, objective - the lens or system of lenses nearest the object being viewed

reflecting telescope, reflector - optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece; "Isaac Newton invented the reflecting telescope in 1668"

refracting telescope - optical telescope that has a large convex lens that produces an image that is viewed through the eyepiece