Changes

=== Water on Mars ===

=== Water on Mars ===

[[Image:Weeping_100.jpg|thumb|100px|right|Multiple gullies in a south-facing wall in the Gorgonum Chaos region on Mars]]

[[Image:Weeping_100.jpg|thumb|120px|right|Multiple gullies in a south-facing wall in the Gorgonum Chaos region on Mars]]

Mars cannot have liquid water on its surface. The thin atmosphere does not permit this, even during high summer on Mars. Yet the [[Mars Global Surveyor]] mission in June 2000 took photographs of gully-like formations on several precipices and crater walls on Mars. These formations tend to occur between 30° and 70° north and south latitude. Mission analysts further suggest that these formations are relatively fresh and estimate that liquid water might be found less than 500 meters beneath the surface.<ref name=msss>"[http://www.msss.com/mars_images/moc/june2000/ MOC Images Suggest Recent Sources of Liquid Water on Mars]." Malin Space Science Systems, June 22, 2000. Accessed May 27, 2008.</ref>

Mars cannot have liquid water on its surface. The thin atmosphere does not permit this, even during high summer on Mars. Yet the [[Mars Global Surveyor]] mission in June 2000 took photographs of gully-like formations on several precipices and crater walls on Mars. These formations tend to occur between 30° and 70° north and south latitude. Mission analysts further suggest that these formations are relatively fresh and estimate that liquid water might be found less than 500 meters beneath the surface.<ref name=msss>"[http://www.msss.com/mars_images/moc/june2000/ MOC Images Suggest Recent Sources of Liquid Water on Mars]." Malin Space Science Systems, June 22, 2000. Accessed May 27, 2008.</ref>