Post by Dr Norbert Schörghofer, University of Hawaii, Honolulu.
Slope streaks are a form of down-slope mass movement on the surface of Mars that frequently occurs on Mars today (Image 1 and 2). Slope streaks were first identified on high-resolution Viking Orbiter images, but their present-day activity was only discovered in Mars Orbiter Camera (MOC) images.
Image 1. A portion of a Mars Orbiter Camera image taken on 1999-10-28.
Image 2: An Image of the same area taken on 2002-06-10. A large new slope streak formed, while numerous other streaks persisted. North is up and illumination is from the lower left (Schorghofer et al. 2007).
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