Science fiction writers thought that life might exist beneath the thick clouds covering Venus. We now know that conditions there are too extreme for life as we know it. 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 degrees celcius. This atmosphere reflects sunlight, making Venus very bright when viewed from earth.
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