Carl Sagan talks about of Venus and Venera probes. (english)

Carl Sagan describes the terrible conditions of Venus using the information of the Soviet Venera probes. Carl Edward Sagan (November 9, 1934 – December 20 .\r
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NEXT: Sure getting to Venus or even Mars is easy. But what about the outer planets which we exponentially further away? Find out.\r
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Venera 7, 8, 9, 10, 13, 14, 15, 16 and American probe Magellan.