NAC image M115475912R shows hummocky terrain north of the central peak of Tsiolkovskiy, still within the crater rim but outside the region flooded by mare basalt. The hummocks formed as the crater rebounded after the shock of impact dissipated. Image is 940 m wide, with an incidence angle of 75° [NASA/GSFC/Arizona State University].

The central peak of Tsiolkovskiy crater is surrounded with mare basalt. This NAC frame shows where boulders rolled down the central peak and onto the mare basalt (note the boulder trails). The central peaks of larger lunar craters like Tsiolkovskiy are of particular scientific interest, because they expose rocks uplifted from great depth during the impact process. This image is 890 m wide with an incidence angle of 88° [NASA/GSFC/Arizona State University].

Small fractures in the mare floor of Tsiolkovskiy Crater are a departure from the usual scene of smooth mare pitted with impact craters. As the mare cools, fractures like these can form, or these fractures might have formed due to changes in the morphology of the Tsiolkovskiy impact crater over time. Image width is 580 m; NAC Image M130822373R, incidence angle 73° [NASA/GSFC/Arizona State University].