Tsiolkovskiy (crater)

Tsiolkovskiy is a large lunar impact crater that is located on the far side of the Moon. Named for Russian scientist Konstantin Tsiolkovsky, it lies in the southern hemisphere, to the west of the large crater Gagarin, and northwest of Milne. Just to the south is Waterman, with Neujmin to the south-southwest. The crater protrudes into the neighbouring Fermi, an older crater of comparable size that does not have a lava-flooded floor.

Tsiolkovskiy has been considered one of the largest craters of the Upper (Late) Imbrian age, although that dating was revised to the Imbrian/Eratosthenian boundary in 2013. A number of sites on its walls and central peak have slopes over 45°, leading some to propose a Late Eratosthenian dating.^: 333