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For an object to be a planet it has to : orbit the sun, has enough mass to assume a rounded shape, and clear any objects in its path.

Some planets (such as Pluto) are no longer planets because they do not fit the criteria above. They are then usually classed as dwarf planets.

Asteroids are small pieces of rock which orbit the sun. These are much too small to become planets/dwarf planets and also don't fit the criteria above.

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