1. Mercury Dominika Krišková Viera Mižaninová 1.B

2. Mercury Mercury is the innermost and smallest planet in the solar system, orbiting the sun once every 88 days. It can only be seen in morning or evening twilight. Mercury is similar in appearance to the Moon: it is heavily cratered, has no natural sattelites and no substantial atmosphere. Mercury is too small for its gravity to retain any significant atmosphere over long periods of time; however, it does have a "tenuous surface-bounded exosphere" containing hydrogen, helium, oxygen, sodium, calcium and potassium. Mercury is a planet of extremes. Temperature variations swing from 90 K to 700 K. It's hotter on Venus, but with less fluctuations. Mercury also has a very eccentric orbit; at perihelion it is only 46 million km from the Sun but at aphelion it is 70 million.

3. Questions ☺ When can we see Mercury ? ☺ What is the temperature Mercury? ☺ How many natural sattelites has Mercury?

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