The central portion of Osuga Valles, which has a total length of 164 km. In some places, it is 20 km wide and plunges to a depth of 900 m. Credit: ESA/DLR/FU Berlin, CC BY-SA 3.0 IGO
The valley networks of Mars bear a strong resemblance to those found in arid landscapes on Earth. Researchers have been able to demonstrate this using the branching angles of river valley confluences. Based on these observations, they infer that Mars once had a primeval climate in which sporadic heavy precipitation eroded valleys. The surface of Mars bears imprints of structures that resemble fluvial steam networks on Earth.
Scientists therefore assume that there must have been once enough water on the red planet to feed water streams that incised their path into the soil...
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