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Mariner 10, Venus & Mercury
Date Issued: 1975-04-04
Postage Value: 10 cents

Commemorative issue
Space
Mariner 10, Venus & Mercury

Despite a series of problems, Mariner 10 accomplished the first two-planet space mission ever flown by a U.S. unmanned space probe. It was launched in November 4, 1973 to fly close to Mercury and Venus. Using ultraviolet filters, the probe revealed a wealth of details in the clouds surrounding Venus, including several distinct layers and a stationery convention cell near the planet's subsolar point. The Mercury flyby, which was a late addition to the project, allowed a unique path for Mariner to take advantage of Mercury's path around the sun and view the planet three times during the mission.

Topic: Space (144)  

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