Main Page | See live article | Alphabetical index Alder is a crater on Earth's Moon, named after Nobel-winning chemist Kurt Alder. It is 77km in diameter and located at 48.6°S, 177.4°W, in the South Pole-Aitken basin. Alder crater is associated with the only area in the basin not dominated by the pyroxene rocks typical of lunar lowlands. This alder ejecta area is on spectrographic evidence instead principally anorthosite rock, typical of the lunar highlands. See also List of Lunar craters External links Article on the South Pole-Aitken (SPA) basin mentioning Alder crater. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.