Presents information on Mercury, the planet closest to the sun, as it was photographed by the U.S. spacecraft, Mariner 10. Includes a glossary and "Mercury Quick Facts."
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Describes what is known about Mercury from the photographs taken by Project Mariner.
"Describes what is known about Mercury from the photographs taken by Project Mariner."--Title page verso.
Presents information on Mars, the reddish orange planet, and its exploration by the U.S. spacecraft, Mariner and Viking. Includes a glossary and "Mars Quick Facts."
Presents information on Mars, the reddish orange planet, and its exploration by the U.S. spacecraft, Mariner and Viking. Includes a glossary and "Mars Quick Facts."