You can read the Science papers themselves online . Also, here are the best evidence images , the Mars Photo Gallery , and a super close-up . In addition to making it considerably more likely we'll eventually find Life in the Martian subsurface, the recent or current presense of water also will make it much easier for humans to explore.
Water is necessary for drinking, and makes a dandy fuel when separated into oxygen and hydrogen.
Images taken by the Mars Global Surveyor prove that Mars had at least one persistent, meandering river . Another MGS image released at the same time shows Mars has depositional layers, like those you can see on the walls of the Grand Canyon. Mars Surveyor 1998 Search the Entire Mars Website . When you click on the image for high resolution, you'll notice the afternoon clouds and haze within the deeply-carved valley system. The batteries on both the Sojourner rover and the Sagan Station lander stopped working in September, and the two vehicles may now be too cold to function even with solar panels.