23. According to current scientific theory, how did the planets of the solar system form?
Solid grains of various sizes collided and stuck together, building up to make the planets.
Chunks of the early sun split off and began to revolve around what was left.
A supernova of another sun threw large, planet-size chunks toward our solar system's sun.
The strong gravitational pull of our sun drew the planets away from other solar systems.
