Data from the Pioneer spacecraft of NASA apparently prove the theory that the high
surface temperature of Venus is due to an atmospheric greenhouse effect caused
mainly by a blanket of carbon dioxide. Such a greenhouse effect is created when
energy in the form of sunlight easily passes through a planet's atmosphere, warms i
surface, and is converted to heat radiation that is then held in by the atmosphere fra
top to bottom. Venus has a relatively thin atmosphere like the Earth's, but Venus'
atmosphere consists of more than ninety percent carbon dioxide, compared to less
than four percent in that of the Earth. Because of its higher percentage of carbon
dioxide, Venus' atmosphere traps much more heat radiation than does the Earth's.
Thus, the Venus studies are believed to be important to the understanding of possibl
adverse effects on the Earth's agriculture that could result from the long-term use of
fossil fuels, which add carbon dioxide to the atmosphere.
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