English: en:Mare Tranquillitatis sits within the Tranquillitatis basin. The mare material within the basin consists of basalt in the intermediate to young age group of the Upper Imbrian epoch. The surrounding mountains are thought to be of the Lower Imbrian epoch, but the actual basin is probably Pre-Nectarian. The basin has irregular margins and lacks
a defined multiple-ringed structure. The irregular topography in and near this basin results from the intersection of the
Tranquillitatis, Nectaris, Crisium, Fecunditatis, and Serenitatis basins with two throughgoing rings of hypothetical Procellarum basin. Mare Serenitatis is seen in the upper left of the photo below. Palus Somni, on the northeastern
rim of the mare, is filled with the basalt that spilled over from Tranquillitatis. This mare also served as the landing
site for Apollo 11, the first manned landing on the Moon.
The NASA website hosts a large number of images from the
Soviet/
Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The
SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use.
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en:Mare Tranquillitatis sits within the Tranqillitatis basin. The mare material within the basin consists of basalt in the intermediate to young age group of the Upper Imbrian epoch. The surrounding mountains are tho
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