la silla observatory is an observatory in chile with eighteen telescopes that study the stars. the observatory is one of the biggest in the southern hemisphere. la silla is a 2,400 meter high mountain that is found in the far southern part of the atacama desert. it can be found about 160 kilometers north of la serena, 27 kilometers south of the las campanas observatory, and about 100 kilometers north of the cerro tololo observatory.