Asteroids are small bodies in the Solar System made out of rocky material and iron-nickel metal.
The asteroids are located mainly between Mars and Jupiter, known as the main asteroid belt. The DAWN mission will visit two of the asteroids shown below, Vesta and Ceres.
Why is asteroid Ceres spherical (round like a ball)?

Why are asteroids Eros, Gaspra, and Vesta
irregular in shape?

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