- 2001 Mars Odyssey@
- Learn about NASA's 2001 Mars Odyssey, an orbiter making global observations of Mars. Sites discuss the Odyssey's mission to detect health hazards for future human space explorers and search for water and evidence of life-sustaining environments.
- Canyons of Mars, From Silicone Dust Rivers?
 - Personal hypothesis that the canyons of Mars may have been eroded by rivers of silicone dust made from silica reacted to an ancient methane atmosphere. - Case of the Missing Mars Water
- Science@NASA article regarding signs of heavy flooding and mysterious valley networks on Mars.
- Is There Water on Mars
(PDF) - NASA Educator Guide explores the question of whether there is water on Mars.
- Mars Exploration Rover Mission@
- Learn about NASA's twin robot geologists, the Spirit and Opportunity Rovers, that landed on Mars in January 2004 in search of answers about the history of water on Mars. Sites feature extensive photo galleries and mission updates from the Red Planet.
- Mars Global Surveyor@
- See photographs of Mars surface and learn about the Red Planet's weather from data gathered by NASA's Mars Global Surveyor orbiter.
- Mars Orbiter Camera Images Suggest Recent Sources of Liquid Water on Mars
- See the images of the gullies on Martian cliffs and crater walls that were captured in a small number of high-resolution images from the Mars Global Surveyor, suggesting that liquid water has seeped onto the surface of Mars in the geologically recent past.
- Mars-Ice.org Consortium
- Learn about Martian ice and the different regions - North pole, Tharsis region, and South pole - where it is present of the Red Planet. From the USGS Astrogeology Team and Arizona State University.
- Mars: Signs of a Watery Past
- NASA Goddard Institute describes signs of water on the surface of Mars.
- NASA Images Suggest Water Still Flows in Brief Spurts on Mars
- See the Mars Global Surveyor photographs that have revealed bright new deposits seen in two gullies on Mars, suggesting that water carried sediment through them sometime during the past seven years.
- NASA Spacecraft Confirms Martian Water, Mission Extended
- NASA mission news: Laboratory tests aboard NASA's Phoenix Mars Lander have identified water in a soil sample.
- Once Upon a Water Planet
- Science@NASA 2002 article summarizing the mounting evidence that water lies beneath the Martian terrain.
- Special Report: June 20, 2000 Evidence of Water on Mars
- Series of SPACE.com articles relating to NASA's announcement of discovering evidence of water on Mars.
- Water Ice on Mars Confirmed - SPACE.com
- SPACE.com article about the Phoenix Mars Lander's confirmation of the existence of water ice on Mars.
- Water on Mars - Mars 101
- NASA discusses the evidence for past liquid water on Mars that has been gathered by previous and current Mars missions and answers questions about where this liquid water went.
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