Total posts from Sarah Braden 84
04 Nov 2010
03 Nov 2010
02 Nov 2010
23 Sep 2010
The pattern of ejecta from a young crater is still preserved on the floor of Van de Graaff crater. The variations in albedo (bright and dark areas in the ejecta) indicate either different surface exposure times, grain sizes, or composition. Image is from NAC frame M110479695L with a width of 650 m and an incidence angle of 30° [NASA/GSFC/Arizona State University].
22 Sep 2010
This crater in the floor of Van de Graaff crater has a high reflectance ejecta blanket compared to the surrounding low reflectance material. The contrast in albedo is due to the crater excavating "fresh" or "immature" material from underneath the surface. Image width is 650 m; NAC Image M110472904R; 30° incidence angle [NASA/GSFC/Arizona State University].
21 Sep 2010
26 Aug 2010
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].
25 Aug 2010
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].
24 Aug 2010
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].
04 Aug 2010