What is the largest planet in the Solar System?

The story behind the answer

Jupiter is the largest planet in the Solar System: about 11 times Earth’s diameter, over 1,300 Earths could fit inside it, and it’s 318 times Earth’s mass. By comparison, Saturn is the second-largest, while Earth and Mars are much smaller rocky planets.

A hydrogen–helium gas giant, Jupiter spins rapidly, showing colorful cloud bands and the Great Red Spot, a centuries-old storm. Its powerful gravity shapes the Solar System and shepherds many moons—over 90—including Ganymede, the largest moon. Memory tip: Jupiter is named after the king of the Roman gods—think “king-sized.” Or remember “Jupiter = Jumbo,” the biggest planet of all.