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Jeff plescia posts 27
Debris flows I

Debris flows I

Debris flow extending down the southwest wall of Janssen K crater (a highlands crater about 16 km in diameter). Image width is 570 meters (NASA/GSFC/Arizona State University).

Published on 04 Dec 2009

More Impact Melt!

More Impact Melt!

Frozen impact melt flows on the floor of Moore F, a farside highlands crater. Image width 600 m, 0.61 m/pixel,  NAC image M110383422LE [NASA/GSFC/Arizona State University].

Published on 30 Oct 2009

Illumination comparison of a mare crater

Illumination comparison of a mare crater

Same crater from two LROC NAC frames under very different lighting. On the left the Sun was midway to the horizon and on the right the Sun was high, approaching noon. Under lower Sun, surface roughness is quite evident; under higher sun...

Published on 20 Oct 2009

Surveyor 1 - America’s first soft lunar landing

Surveyor 1 - America’s first soft lunar landing

Surveyor 1 spacecraft sitting silently on Oceanus Procellarum, the first US spacecraft to land on another planet (June 2, 1966). The image was taken in the lunar afternoon such that the sun in low on the western horizon and the 3.3...

Published on 30 Sep 2009

Uplift, Boulders of Tsiolkovskiy

Uplift, Boulders of Tsiolkovskiy

Boulders perched on the summit of the central peak of Tsiolkovskiy crater [NASA/GSFC/Arizona State University].

Published on 01 Sep 2009

Stream of Secondary Craters

Stream of Secondary Craters

LROC NAC frame showing a string of secondary craters from an impact crater to the north, probably Giordano Bruno. Image width is 4.5 km [NASA/GSFC/Arizona State University].

Published on 05 Aug 2009

Bright Crater Rays and Boulders

Bright Crater Rays and Boulders

Small (250 m diameter) fresh impact crater surrounded by an asymmetrical bright ejecta blanket [NASA/GSFC/Arizona State University].

Published on 03 Aug 2009