By gully!

MARS RE­CON­NAIS­SANCE ORBITER, 18 APRIL 2017

Sky at Night Magazine - - EYE ON THE SKY -

This gul­lied crater in Mars’s north­ern hemi­sphere was cap­tured by the HiRISE in­stru­ment on the MRO in Jan­uary 2017, but has only just been re­leased by NASA. Gul­lies are steep slopes that are formed on Earth by flow­ing wa­ter, but on Mars their for­ma­tion is thought to be driven by the build-up of frozen car­bon diox­ide over win­ter, which then sub­li­mates into gas dur­ing Mar­tian spring.

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