JUPITER

The main feature of the giant planet, Jupiter, is its Great Red Spot. This is an area in the planet's atmosphere (coloured red!) which Earth could fit into three times! It has been observed on the planet's surface for centuries and what it was remained a mystery until the Pioneer 10 and 11 missions were launched in 1972 and 1973 to take a look at the Gas Giants, followed by Voyager 1 and 2 in 1977. 

Venus

Venus and Mercury are the only two planets in the Solar System not to have moons orbiting them.