Page loading too slow? Try the HTML Version Try the Flash Version News Read More.. The Gazetteer of Planetary Nomenclature is maintained by the Planetary Geomatics Group of the USGS Astrogeology Science Center. This work is supported by the National Aeronautics and Space Administration under Contract No. NNH09AL18I issued through the Office of Space Science. This site is developed in cooperation with the International Astronomical Union.