Jupiter

Jupiter is the biggest gas giant and biggest planet orbiting Sun.

Moons
Jupiter has 69 moons, the 4 biggest are Io, Europa, Ganymede, and Callisto, all the others are so small, they don't have enough gravity to keep themselves spherical so the other 65 moons are all randomly shaped.

Great red spot
Jupiter has a red spot that is a raging storm and is bigger than Earth. It has been raging for over 300 years, but is possibly dying because every year the storm got smaller and smaller.