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Mercury is the eighth largest planet in our solar system, equaling roughly one-third of Earth’s size. It is also the planet closest to the sun, and is often visible with binoculars, or even the naked eye. It’s difficult to see in the twilight sky. O ....

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.... range of any planet or natural satellite in our solar system. The surface temperature on the side of Mercury closest to the Sun reaches 427 degrees Celsius, a temperature hot enough to melt tin. On the side facing away from the Sun, or the night side, the temperature drops to -183 degrees Celsius. Scientists have detected a magnetic field surrounding Mercury, though it is not as strong as the field around the Earth. Scientists theorize that Mercury's field is due to an iron-bearing core or possibly to the solar winds. Mercury's atmosphere is very thin and is composed of helium and sodium. The surface of Mercury has been shaped by three processes: ....