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The tantalizing seasonal flows observed on Mars last year may indeed be caused by liquid water, a new study suggests.

The melting and subsequent evaporation of frozen salty water could cause the intriguing dark streaks, researchers said. These lines, which were spotted by NASA's Mars Reconnaissance Orbiter spacecraft, extend down some Martian slopes during warm months and fade when winter comes.

“In one day we could form enough liquid to create these flow features on the surface," lead author Vincent Chevrier, of the University of Arkansas, said in a statement.