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came as no surprise to astronomers. The clearest evidence for liquid water on Mars came from dark streaks known as recurring slope linnea (RSL). These streaks form in the spring and disappear later in the Martian year. Spectroscopic analysis showed that the streaks are hydrated perchlorate, a briny liquid of perchlorate salt with water trapped in its crystals. Know more about the Martian discovery in the infographic below.