Venus rotates extremely slowly, while it takes about 8 months for it to revolve around the Sun. Venus rotates so slowly, that it s day is longer than it s year. The prediction proposed by astronomers is that Venus was hit by a large object billions of years ago, causing the direction of Venus rotation to change. The atmosphere of Venus is so thick that every day is a cloudy one. If you could stand on the surface of Venus, you would immediately be smashed by the weight of it s pressure.
Earth is the third planet from the Sun.
The Earth s atmosphere extends 100 kilometers above it s surface. Oxygen makes up about 20 percent of Earth s atmosphere. Almost all the rest is made of nitrogen gas, with a little carbon dioxide. Mars is called the red planet because of its reddish look. The atmosphere on Mars is mostly made of carbon dioxide.