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Mercury |
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| Mercury orbits closer to the Sun than any other planet, making it dry, hot, and virtually airless. Although the planet’s cratered surface resembles that of the Moon, it is believed that the interior is actually similar to Earth’s, consisting primarily of iron and other heavy elements. This composite photograph was taken in 1974 by Mariner 10, the first probe to study Mercury in detail. | ||||||
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| NASA/Science Source/Photo Researchers, Inc. | ||||||
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| Appears in these articles: | ||||||
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| Mariner; Mercury (planet) | ||||||
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