# Write a note on Mercury.
ANS:
* It is the smallest planet of our solar system.
* It is nearest to the sun, i.e. its orbit is the smallest.
* Its mass is about (1/18)th the mass of the earth.
* Its gravitational field is weak.
* Its atmosphere is thin and consists mainly of vapours of sodium and potassium.
* Its day temperature is 427°C and the night temperature is (-173)°C.
* Its surface has many craters formed by meteors. Some of the craters are volcanoes.
* It has no satellite.
* Life is not possible on this planet.
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