Gullies of this kind, on craters or on slopes of the surface of Mars, convinced NASA scientists that water flows there.
The related announcement has once again fueled fantasies about “inhabiting the planet.” Until robots or human missions colonize it, the screenwriters of science fiction films should enrich their repertoire: alien plumbers and (why not?) alien rowers should acquire some kind of leading role in the next installment of “Star Wars.” Naval battles? Why not? Oldies but goodies!