In our model, Mars is only .088 inches across, and is 75 meters from the Sun.

The center of this image shows the entire Valles Marineris canyon system, over 3,000 kilometers long and up to 8 kilometers deep.

Many huge ancient river channels begin here and run north.

More recent data from NASA's Mars Global Surveyor spacecraft suggest there may be current sources of liquid water at or near the surface of Mars.

Does Mars emit radio waves?