Lunar Reconnaissance Orbiter Camera

Rough Crater Wall Surface

Upper part wall inside an unnamed fresh crater. LROC NAC M182038126L. Image center is 4.032°S, 227.632°E, image width is 1084 m. Downslope is toward lower right, north is to the top [NASA/GSFC/Arizona State University].

The opening image reveals the northwestern portion of the steep wall inside an unnamed young crater (6.8 km in diameter, the same crater in Tuesday's Featured Image). The upper left corner of this image, the relatively smooth part, corresponds to the outer gently sloping surface, and the rest of the image is the interior wall. 

This steep surface displays very complicated forms, likely due original flow of impact melt down the walls, perhaps in places modified by small scale collapses. Several spots indicated with arrows show the contact between relatively smooth surface materials, probably impact melts, and sharp craggy edges. Are the smooth parts really impact melt? Or perhaps they are surfaces from which hardened impact melt slipped down. What we do know is that enormous amounts of impact melt were splashed around inside and outside the crater, a violent scene we can hardly imagine. New LROC data is unveiling the nature of impact melts through their shape, texture, distribution, quantity, and spectral reflectance.

The unnamed crater and surrounding areas in the LROC WAC monochrome mosaic (100 m/pix). Image center is 4.16°S, 227.62°E. The NAC footprint (blue box) and the location of opening image (yellow arrow) are indicated [NASA/GSFC/Arizona State University].

Explore this fresh and complicated crater wall in full NAC frame!

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