SOLAR SYSTEM

Detailed explanation-1: -Gravity causes light gases to move to the center while heavier materials and ice stay in outer areas. Then what? The center of the nebula begins to get hot and dense. A protostar forms in the center of the nebula.

Detailed explanation-2: -The nebular hypothesis is the idea that a spinning cloud of dust made of mostly light elements, called a nebula, flattened into a protoplanetary disk, and became a solar system consisting of a star with orbiting planets [12].

Detailed explanation-3: -The steps to nebular theory go as follows. Nebula becomes a solar nebula as a region within the cloud of gas and dust condenses into a core and forms a protostar. The condensing material could have been caused by a nearby supernova shockwave. The material surrounding the protostar collapses into an accretion disk.

Detailed explanation-4: -The Sun and the planets formed together, 4.6 billion years ago, from a cloud of gas and dust called the solar nebula. A shock wave from a nearby supernova explosion probably initiated the collapse of the solar nebula. The Sun formed in the center, and the planets formed in a thin disk orbiting around it.

Detailed explanation-5: -The nebular theory explains the composition of planets. The inner planets were closer to the protosun, the temperatures were high. As a result, the planets compose of materials with high melting temperatures, metals and rocky material. The outer planets contain large quantities of ices as the temperatures were lower.