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34   True   Metric A=100   Metric B=180   Metric C=10   Sum=290   Links=0   Source=9
  Evidence Mounts for Ancient Martian Ocean http://www.space.com./scienceastronomy/solarsystem/mars_coast_991210.html
991210 The vast lowlands that cover most of Mars' northern hemisphere have long posed an interesting puzzle for scientists: Dry river channels that appear to have carried more water than the greatest rivers on Earth run into a wide empty basin that is exceedingly flat and apparently dry.During the past decade a handful of planetary geologists have achieved notoriety by proposing that an ancient ocean likely covered most of the planet's northern hemisphere. They have argued that surface features show evidence of ancient coastlines around the perimeter of the northern basin -- a proposal that has generated controversy since it was advanced.The claims have been difficult to substantiate because they were based on interpretation of images taken by orbiting spacecraft -- an inexact and often subjective exercise.But now, a team of scientists from Brown University is announcing that evidence from the Mars Global Surveyor supports the idea that a wide ocean did once cover the-