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.