Mars

Mars is the fourth planet from the Sun.

Characteristics
Mars, like Earth, has polar ice caps of water. Mars has large mountains and valleys, and some are visible from space. The surface of Mars is home to thousands of craters. Dust storms are a common event on the Martian surface.

Atmosphere
Mars's atmosphere is roughly 95% Carbon Dioxide, 2% Argon, and 0.15% Oxygen. The Martian atmosphere is extremely thin, having a surface pressure of 610 Pascals. For comparison, the Earth's surface pressure at sea level is 101,000 Pascals.

Core
Mars's core does not rotate fast, hence it can't produce the amount of energy needed to give it a magnetic field.