Central Peak of Bullialdus Crater
The summit of the central peak of Bullialdus crater, an exploration region of interest located in the western part of Mare Nubium. Spectroscopic observations of Bullialdus using terrestrial telescopes showed that Bullialdus is compositionally distinct from the surrounding region. Later studies using Clementine multispectral data indicated that there are several rock types exposed on the floor of the crater. Lunar scientists who have studied Bullialdus proposed that the impact excavated mafic materials from great depth. Lunar scientists need to discover what these mafic materials are - are they some type of exotic mare basalts? Rare highlands non-mare volcanic rocks? We don't know, and we must find out to fully understand the Moon.
The central peak of Bullialdus is about a kilometer high. Astronaut explorers will not only have to explore around the base, but probably also scale this small mountain to collect the diverse array of samples required to really answer this question.
Credit: NASA/GSFC/Arizona State University