Mars Was Covered By Huge Ocean, Say Experts

The new map showing that Martian valley networks are more than twice as extensive
as had previously been thought Photo: PA

From The Telegraph:

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.

Scientists have produced a new map showing that Martian valley networks are more than twice as extensive as had previously been thought, indicating that they were carved by rivers.

They are concentrated in a belt circling the planet's equator and mid-southern latitudes.

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