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].
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