As a groove (also in English) or Rima (Pl. Rimae , Latin for 'column', 'crack') is a relatively narrow, elongated depression in the surface of the Earth's moon . A distinction is made between two types of grooves, each of which evidently resulted from completely different geological processes:
- Grooves in particular were created by geological disturbances and correspond to the tectonic rifts and rifts on earth. They are usually several thousand meters wide and hundreds of kilometers long. Their depth is up to 400 meters.
- Winding grooves are strongly reminiscent of earthly channels , especially since they start in higher terrain and obviously follow the gradient. However, since there never was liquid water on the moon, they are very likely to be traced back to lava flows associated with Mare volcanism, and some of them are probably also lava tubes , the ceiling of which has completely collapsed in sections. Crater-like depressions are often found at the upper ends of these grooves, which are several 100 kilometers long.
The most famous moon grooves are:
- Rima Hyginus with the small Hyginus crater at the kink of the groove
- the branched Triesnecker grooves,
- Rima Hadley at the foot of the Montes Apenninus, near which Apollo 15 landed
- the broad Rima Ariadaeus .
- Moon on May 11, 2019 (2) - Photo taken by an amateur astronomer on Spektrum.de, which u. a. shows the Triesnecker and Hyginus groove (s) southeast of the Mare Imbrium
- Rille (Rima), Rillengruppe (Rimae) on AstroLink.de (in cooperation with the Physikalischer Verein, Frankfurt a. M.)
- Junichi Haruyama, Kazuyuki Hioki, Motomaro Shirao, Tomokatsu Morota, Harald Hiesinger, Carolyn H. van der Bogert, Hideaki Miyamoto, Akira Iwasaki, Yasuhiro Yokota, Makiko Ohtake, Tsuneo Matsunaga, Seiichi Hara, Shunsuke: Possible. Carleakanot M. lunar lava tube skylight observed by SELENE cameras. Geophysical Research Letters. Vol. 36, No. 21, 2009, L21206, doi : 10.1029 / 2009GL040635