Mariner 10 Venus/Mercury Set of 4 x 10 Cent US Postage Stamps NEW Scot 1557
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Mariner 10 Venus/Mercury Set of 4 x 10 Cent US Postage Stamps NEW Scot 1557

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  • Space
  • NASA

This is a block of 4 stamps as pictured. ~ On April 4 1975 in Pasadena, CA; the USPS commemorated Mariner 10, a robotic space probe launched on November 3, 1973 to fly by the planets Mercury and Venus. It was launched approximately 2 years after Mariner 9 and was the last spacecraft in the Mariner program (Mariner 11 and 12 were purposed to the Voyager program and re-designated Voyager 1 and Voyager 2). The mission objectives were to measure Mercury's environment, atmosphere, surface, and body characteristics and to make similar investigations of Venus. Secondary objectives were to perform experiments in the interplanetary medium and to obtain experience with a dual-planet gravity assist mission. Mariner 10 was the first spacecraft to make use of an interplanetary "gravitational slingshot" maneuver, using Venus to bend its flight path and bring its perihelion down to the level of Mercury's orbit. This maneuver, inspired by the orbital mechanics calculations of the Italian scientist Giuseppe Colombo, put the spacecraft into an orbit that repeatedly brought it back to Mercury. Mariner 10 used the solar radiation pressure on its solar panels and its high-gain antenna as a means of attitude control during flight, the first spacecraft to use active solar pressure control.

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