Some science fiction writers thought that it is indeed possible that life exists beneath the thick clouds covering the planet Venus. However, conditions there are too extreme for life to survive. Robot spacecraft have landed on Venus and studied its atmosphere, which is mostly poisonous carbon dioxide and sulphuric acid. We cannot see the planet's surface through its thick atmosphere, but enough sunlight gets through to raise the surface temperature to 480 C. This atmosphere reflects sunlight, making Venus very bright when viewed from Earth.
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