Ceres, the coolest asteroid

Ceres is by far the coolest asteroid in our solar system. It's huge, it's round, and could have tons of water.

How big is it? Well, let's put it this way, if you took the combined mass of all the known asteroids Ceres' mass makes up more than 1/3 of that total.

That's big enough to take on a spherical shape apparently. If you want to know the exact size, it's 578 miles in diameter.

The picture on the left is from Hubble and is the best picture we have of Ceres. However, in 2007 a spacecraft was launched to visit Ceres by 2015. The spacecraft is called Dawn and will pass by Vesta first, which could be the second largest asteroid in the solar system with an irregular diameter that averages around 500 miles.

Ceres is icy like Jupiter's moons Callisto and Europa, but Vesta is all rock.

On the right is a picture comparing Ceres size to Earth.