Asteroids are made up of metals and rocky material, while comets are made up of ice, dust and rocky material. Both asteroids and comets were formed early in the history of the solar system about 4.5 billion years ago. Asteroids formed much closer to the Sun, where it was too warm for ices to remain solid.
They are both celestial bodies that orbit our sun. Made of ice. Made of metal debris. They are smaller compared to the planets. They are the center of our solar system.
