Are asteroids larger than planets

No. If all of the space rocks in our asteroid belt were put together into one boulder, it would be 1/3 the size of(it was either the Earth or our Moon). If it was the size of a planet or bigger, then it wouldn't be called an asteroid. Asteroids are space rocks floating through space with an irregular shape and is really small compared to planets, moons, etc. They are leftovers from the formation of our early solar system.