March 5, 2005; Vol. 167, No. 10 , p. 149 Martian Landscaping: Spacecraft eyes evidence of a frozen sea Ron Cowen A flat region near the Red Planet's equator may hold a frozen ocean that was once as deep and big as the North Sea. The region's relatively craterless facade suggests that water gushed to the surface and froze recently, raising the possibility that life might exist today on or just beneath the surface, says Mars Express researcher John Murray. Last week, his team reported its analysis of images that were taken by the orbiting Mars Express spacecraft. In this...