Proposed missionsAfter missions discovered the reality of the harsh 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 SovietVega programin 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 NASAcontractor Global Aerospace proposed a balloon that would be capable of staying in the upper atmosphere for hundreds of Earth days as opposed to two.A solar flyer has also been proposed by Geoffrey A. Landisin place of a balloon,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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