Through the use of satellites the public has been able put a images and color to the planets in our solar system. NASA has launched many satellites and with them have captured photographs of all nine planets. These photographs have been the defining images of the planets so from this research we are able to know more about the other planets in our solar system.
Mercury has a very similar look to Earth's moon. It has a grey rocky surface and does not appear to have any sort of color in its atmosphere.
Venus has thick clouds that block any satellite to get a look at the planets surface. These sulfuric acid clouds are yellowish in color mixed with some lighter hues of yellow as well as some white. Due to the sulfuric acid in the atmosphere the air and the surface of Venus has a reddish brown color. But scientists say if the atmosphere could be removed the planet would look more neutral grey.
Mars an arid planet that has a reddish brown color due to iron build up in the surface. Due to Mars's atmosphere that creates strong winds the surface dust is moved around making the whole planet have more of a red hue.
Jupiter's swirling colors comes from the multiple gases it is made up of. Orange and white are the prominent colors in the planets atmosphere and they are created by ammonia and ammonium hydrosulfide.
Saturn's is also made up of hydrogen and helium gases like Jupiter, however, small amounts sulfur give the planet a yellows look. The haziness that is noticable with Saturn is attributed to the addition of nitrogen and oxygen gases mixing with hydrogen.
Uranus is the least massive of the giant planets. Like the other giants its atmospheric make up is helium and hydrogen gasses. The planet appears as a pale cyan and the edges lower in value. Uranus is probably one of my favorite planets due to its pale blue color.
http://www.aerospaceweb.org/question/astronomy/q0264.shtml
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