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The dry conditions in the deserts occur due to the lack of rain and snow, which is usually less than 25cm (9.8 in) in a year. The driest desert on Earth is the Atacama, Chile, where in many parts there has not been any rainfall in living memory. Hot desert are found close to the tropics, where the Sun's rays are strongest. Hot desert are freezing at night because there are no clouds to trap the Earth's heat.

Jupiter is the biggest and is truly giant. It is large enough for 11 Earths to fit across its face and 1,300 to fit inside it. There are four giant planets in our Solar System. The next biggest is Saturn, followed by Uranus, and Neptune. They are also known as ''gas giants'' because of their colorful, ice-cold gas atmosphere. Jupiter is shrinking. When it was young it was five times its present size. It is cooling and getting smaller by about 2cm (0.8 in) a year.ha