Intermediate sized objects made during the formation of the solar system that are precursors to large bodies such as planets and asteroids.

small solid bodies believed to have formed during the condensing stage of the solar nebula.

The hypothetical objects, from tens to hundreds of kilometers in diameter, that formed in the solar nebula as an intermediate step between tiny grains and the larger planetary objects we see today. The comets and some asteroids may be leftover planetesimals.

Small chunks of mass that orbit the sun.