SOLAR SYSTEM

Detailed explanation-1: -Kant argued that gaseous clouds he called nebulae would slowly rotate and collapse under their own gravity, and flatten out into a disc. He argued that these flattened regions eventually formed stars and planets.

Detailed explanation-2: -History of the Nebular Hypothesis: In this treatise, he argued that gaseous clouds (nebulae) slowly rotate, gradually collapsing and flattening due to gravity and forming stars and planets.

Detailed explanation-3: -If the solar nebula had cooled in the same way throughout, there would be no composition variations in the Solar System. The same minerals would have condensed everywhere. Instead, the nebula stayed hotter near the center, due to the energetic young Sun, and it cooled more rapidly on the edge.