fun facts about every planet. Mercury: the first planet from the sun the smallest planet in the solar system and the fastest planet. Venus: the hottest planet in the solar system also almost the same size as Earth and it spins upside down Earth: the only planet that has life and the biggest rocky planet Mars: Mars is important we can make life on it it can be our new home. Jupiter: the biggest planet in the solar system also it has a storm that been around for 190 years old and it has rings and it's hard to see them Saturn: Saturn has the biggest rings. A few billion years ago there was a moon close to Saturn, but it was destroyed by its gravity and it made Saturn's rings. Uranus: the only planet tipped on its side and the coldest planet in the solar system. Neptune: the windiest planet in our solar system and the farthest planet from the sun.