Venus is about 95% the size of the Earth and has 82% of the Earth's mass. Like the Earth, Venus has a rocky crust and iron-nickel core. Venus has a thick atmosphere made of 96% (CO2), 3.5% (N2), and 0.5% other gases. At Venus' surface, the air pressure is 91 times the Earth's atmospheric pressure. This is the same as what you would feel if you were 1 km below the ocean surface on the Earth. Surface temperature of Venus is about 470°C!
The gap between transits is the repeating sequence of 8 , 105.5 , 8 , 121.5 years. The next transit after 8 June 2004 will be on 06.06.2012