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Mercury
Mercury is the closest planet to the sun. It is very very hot. Its only 57,900,000 Km (36,000,000 miles). It hurtles around the sun at a speed of 170,000km/h (105,600 mph). If it were any closer, the planet would burn up into the suns blasting heat.Its nearest distance to earth is 45,000,000 Km (28,000,000 miles). Each day lasts 59 earth days and a year lasts 88 earth days! It is always hot ( obviously!!!). Its average temperature on the lit side of the planet is 350°C (660°F). This hot temperature can get to be six times hotter than earth!That's hot! ( think of the sun tan you could get!! You think a sauna is hot!!). Its average temperature on the dark side is -170°C (-275°F). Mercury has no atmosphere, to trap the heat in. The cold can be ten times colder than the inside of a freezer!!! The diameter across the planet is 4,878 Km (3,031 miles). Along with Mars, Venus and Earth, Mercury, they are known as the inner planets, as they are nearest to the sun. They form a group of rocky planets. Mercury's density is 5,440 Kg per cubic square metre (11,990 pounds per cubic yard). This is 5.44 times as dense as water.
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