This year has been an incredible one in terms of Mars exploration with some amazing pics from the Mars Reconnaissance Orbiter.  And there is a mystery that astronomers are trying to solve:

The dark, fingerlike features that creep down steep Martian slopes in warm weather continue to puzzle scientists.

These “recurring slope lineae” (RSL), which have been spotted by NASA’s Mars Reconnaissance Orbiter (MRO) at low and middle latitudes on the Red Planet, fade during cooler months but come back again annually at nearly the same locations over multiple Martian years.

Let’s find out more about these mysterious lines and check out a close up on page 2

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