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• Which is the fourth of the nine planets?        The Mars.
• The distance from the Sun to the Mars:        About 227.9 million km.
• Time taken by the Mars for one revolution around the Sun:            687 days.
• Time required for the Mars for one rotation on its axis:        2 4 hours 37 minutes 35.1 seconds.
• Which space craft conducted the test series by America to gather data regarding the Mars?        Mariner.
• When did Mars-2 of Russia land on the Mars?        On 7th December 1971.
• The space vehicle launched by America to probe the existence of life on the Mars:        Viking I-landed on Mars on 20th July 1976.
• The diameter of the Mars:        6787 km.
• Which are the satellites of the Mars?        Deimos, Phobos.
• Which is known as the red planet?        The Mars.
• Which planet has similarly in atmosphere with the Earth?        The Mars.
• The speed of revolution of the Mars:    24 km/Sec.
• What is the weight of the Mars?        1/10 of that of the Earth.
• What is the peculiarity of the clouds in the Mars?        There is no moisture, but only dust in the clouds found in the Mars.
• Who discovered the existence of water vapour in the Mars?        Huggins (1867).
• Who detected the dark areas on the surface of the Mars?        W. H. Pickering.
• Who detected canals on the surface of Mars?        Schiaparelli (Italian astronomer) in 1877.
• What is the gravitational pull of the Mars?        0.4 part of that of the Earth.
• Which are the mountains seen in Mars?        The great Martian mountain Nix Olympica (a volcanic mountain).
• Who discovered the Satellites of the Mars?        Asaphal
• What is the diameter of Phobos?        16km.
• In what time Phobos revolve round the Mars?        7 hours 39 minutes.
• The distance between the Mars and Deimos:        23.52 km.
• The diameter of Deimos:        8 km.
• In what time Deimos revolve round the Mars?        7 hours 39 minutes.
• The snows of the Mars are transformed into water vapour without melting into liquid why?        Because the temperature and pressure are very low.  

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