Proposed missions - Proposed missions After missions...

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Proposed missions After missions discovered the reality of the ha rsh nature of the planet's surface, attention shifted towards other targets such as Mars. There have been a number of proposed missions recently however, and many of these involve the little- known upper atmosphere. The Soviet Vega program in 1985 dropped two balloons into the atmosphere, but these were battery-powered and lasted for only about two Earth days each before running out of power and since then there has been no exploration of the upper atmosphere. In 2002 the NASA contractor Global Aerospace proposed a balloon that would be capable of staying in the upper atmosphere for hundreds of Earth days as opposed to two. [52] A solar flyer has also been proposed by Geoffrey A. Landis in place of a balloon, [16] and the idea has been featured from time to time since the early 2000s. Venus has a high albedo , and reflects most of the sunlight that shines on it making the surface quite dark, the upper atmosphere at
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