jpl

Resources:

Jet Propulsion Laboratory
Managed for NASA by the California Institute of Technology, JPL is the leading U.S. center for robotic exploration of the solar system.
http://www.jpl.nasa.gov/

JPL Mars Exploration Program
Various sections: Extreme Planet, Follow the Water, Mars Rocks, Life on Mars?, The Martian Mystique and Just for Kids.
http://mars.jpl.nasa.gov/

Comet Observation Home Page
Comet images.
http://encke.jpl.nasa.gov/

Planetary Photojournal: NASA's Image Access
Publicly released images from various Solar System exploration programs.
http://photojournal.jpl.nasa.gov/