Solar System Facts
Solar System (or planets) Key Facts and properties.
There are 8 Planets in orbit around the Sun.
Mercury is the closest, and Neptune is the outermost Planet in the Solar System.
The further a Planet is from the Sun, the slower it travels, and the more time it takes to complete an orbit.
The further the Planet is from the Sun, the lower its average surface temperature. Except for Venus, where 97% Carbondioxide in the atmosphere causes severe greenhouse effect, and makes Venus the hottest Planet in the Solar System.
Mercury is the smallest, and Jupiter is the largest Planet in the Solar System.
The axis of rotation of Earth is tilted by 23.5o, and the axis of rotation of Uranus is tilted at more than 90o.