MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Water on Mars. Artwork showing seas and oceans of liquid water on the surface of Mars. Its largest moon, Phobos, is seen above it at upper right. Liquid water is thought to have existed on Mars in the distant past. Water may also exist there again if plans to terraform Mars (convert it into an Earth-like environment) make the leap from science fiction to reality.
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