Is there Water on Mars?
Water on Mars has been a fascinating topic in recent years. Scientists had thought that Mars could not have liquid water because the pressure of the atmosphere is too low. By searching images from orbiters, they have discovered hydrated salts, which indicate the presence of liquid water. They also found dark streaks going down hills that lengthen during summer and fade in winter. The streaks are caused by water that flows downhill in summer and freezes in winter.