Prezentace aplikace PowerPoint

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Mercury
Dominika Krišková Viera Mižaninová 1.B
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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.
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Questions ? When can we see Mercury ? ? What is
the temperature Mercury? ? How many natural
sattelites has Mercury?
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Thanks