DAVID DUCROS / SCIENCE PHOTO LIBRARY DAVID DUCROS / SCIENCE PHOTO LIBRARY
Earth and Mars. Artwork of the Earth (upper left) and a partial view of Mars (right). Mars is a cold desert world, with an atmosphere of mostly carbon dioxide. The fourth planet from the Sun, it is just over half the diameter of Earth. Earth is the third planet from the Sun. It has an atmosphere and liquid water, and is the only planet in the solar system known to support life.
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