Early civilizations thought Mercury was two stars, since it can only be seen low in the sky at dusk or dawn. But the Greeks realized that it was a single planet and named it Hermes, after the messanger of the Roman Gods. Mercury is the closest planet to our sun. It has no moons, and is full of craters. Mercury's average distance from the sun is 36 million miles. The diameter of Mercury is 3,031 miles. The length of its year is 87.97 earth days long. Mercury's rotation period (its day) is 58.65 earth days long. The temperture on Mercury's surface can range from -292 degrees at night to 806+ degrees fahrenheit during the day (note: 806 F. is hot enough to melt lead! And -292 degrees is almost cold enough to liquify air on Earth). The mass of Mercury is .055 that of Earth's (The Earth weighs 5,970,000,000,000,000,000,000,000,000,000 tons). The average density of Mercury is 5.52 g/cm cubed. If you need anymore information on Mercury e-mail me using the link below. I have more information.
Mercury Facts
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