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Last updated on April 17, 2014 at 1:21 EDT
Rima Calippus
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Rima Calippus

December 6, 2012
Rima Calippus is a sinuous rille located in northwest Mare Serenitatis at 37° N, 12° E. Sinuous rilles are thought to be volcanic features carved out by flowing lava. Because the lava is so much hotter than the rock it is flowing on, it will start to cut down and form a channel. If the eruption rate is high enough, the lava can undergo turbulent flow, creating even more efficient thermal erosion and create even deeper channels. Rima Calippus in northwest Mare Serenitatis, boulders on the larger branch are possibly outcrop waiting to be sampled. LROC NAC M102078117, image width is 1600 m [NASA/GSFC/Arizona State University].