Gully and defrosting activity have been visible here along the edge of a dune field, along with blocks of frost. Observations of the same area help us check for repeat activity, as well as measuring those meter-scale blocks that we’ve seen prior.
In this case, we want to compare any possible changes with a previous observation
, which we acquired in 2011. We've also seen images where carbon dioxide frost was the driving process in creating new gullies
, so we know their formation is occurring to this day. Tracking for changes, especially when we look at the 1-kilometer enhanced color swath, can help us find more.
This caption is based on the original science rationale. ID
: 14 January 2015 altitude
: 247 km
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