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Second planet from the sun; mass 4.872 x 1027g; radius of cloud surface about 6100 Km; radius of solid surface about 6056 Km; surface temperature 737K; temperature of cloud tops 250K; cloud composition more than 75% H2SO4 and about 25% water; atmosphere (by volume) 90-95% CO2 with traces of SO2, water, CO, H2SO4, Ar, Ne, HF, HCl. Atmospheric pressure 92-95 atm.

[Hopkins, Jeanne. Glossary of Astronomy and Astrophysics. pg 187; 1980; University of Chicago Press.]

Source: Atmospheric Chemistry Glossary