"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.
We all know the "typical" telescope, an optical device used for magnification, but did you know there are other types of telescopes? These include infrared, x-ray and ultraviolet telescopes.