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The biggest impact crater on Earth is the Vredefort crater in South Africa, and the highest mountain is Everest. But what about the rest of the Solar System? Which features are the biggest ones in the whole Solar System?

Biggest in the Solar System - Facts for Kids

Jupiter is the biggest planet and it's the most massive. In size, Saturn has almost 60% of the volume of Jupiter, but Saturn is a lightweight compared to Jupiter. Saturn has such a low density that it's said if you had a big enough ocean, you could float Saturn in it. In terms of mass, Jupiter has two and a half times the combined mass of the other planets.

The biggest moon in the Solar System is Jupiter's moon Ganymede. It's even bigger than the planet Mercury, though Mercury is denser. Here is a comparison between some of the larger Solar System moons.

The International Astronomical Union (IAU) specifically listed five dwarf planets. It correctly shows Pluto slightly larger than Eris. In many images you'll see Eris slightly bigger. That's because it was at first thought that Eris was larger. Pluto's atmosphere made it difficult to calculate the dwarf planet's size. Finally, the New Horizons fly-by of Pluto was able to provide the data needed. (The difference is very small, maybe about thirty miles.)

Ceres is massive enough to be spherical, but Vesta isn't. Bodies that rotate rapidly can be very much flattened, but Vesta just is that shape. Here is a comparison between the two biggest asteroids and four others that have been visited and Mars added for scale.