Solar system is a tiny galaxy in the whole space,there is eight planets in there.The planet that nearest the sun is Mercury,it's diameter is 4,878 km, it is 58 million km from Sun,the second planet is Venus,it's diameter is 12,104km,it is 108 million km from Sun.The third planet is Earth,it's diameter is 12,756km,it is 150million km from Sun.The forth planet is Mars,it's diameter is 6,796km,it is 228 million km fromSun.The fifth planet is Jupiter,it's the biggest planet,it's diameter is 142,984km,up to 86.4152632462 Earths! It is778 million from Sun.

The sixth planet is Saturn,it's diameter is 129,660km,it is 14,27 million km from Sun.The seventh planet is Uranus,it'sdiameter is 51,118 km,it's 2,870 million km from Sun.The eight planet is Neptune,it's diameter is 49,532km,it is 4,497 million km from Sun.

Little secret:Saturn is not the only planet with rings.The Jupiter,Uranus and Neptunealso have rings,but,the Saturn's ring is the easiest to see.So,we thought only the Saturn has a ring only.