Our solar system is thought to have started with the birth of our Sun, which formed from a cloud of interstellar dust and gas. This cloud condensed and eventually collapsed from its own gravitational pull. The heat and pressure built up, forming a protostar. Eventually nuclear fusion began. Planets formed from remaining dust and gas orbiting the protostar.

This explanation best describes _____.
the nebular theory
the big bang theory
the inflation theory
the condensation theory