Valley networks of Mars

A map of the density of drainage channels on Mars, in relation to a hypothetical northern ocean. Image credit: Wei Luo/Northern Illinois University/PA Wire

Undated handout image of a global map depicting the density of valley networks on Mars in relation to a hypothetical northern ocean. PRESS ASSOCIATION Photo. Issue date: Monday November 23, 2009. A single large ocean once covered much of the northern half of Mars, supplied with water from a belt of rain-fed rivers, new research suggests. See PA story SCIENCE Mars. Photo credit should read: Wei Luo/Northern Illinois University/PA Wire

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