20-03-2018 : Mercury The Solar System A commemorative postage stamp

Mercury is the smallest and innermost planet in the Solar System. Its orbital period around the Sun of 88 days is the shortest of all the planets in the Solar System. Mercury is a rocky body like Earth with an equatorial radius of 2439.7 km which is 0.3829 times the radius of the Earth. Mercury consists of approximately 70% metallic and 30% silicate material. Atmosphere is absent in Mercury and its surface temperature ranges from 100K to 700K.