SOLAR SYSTEM

Detailed explanation-1: -Before it was moulded into a neat set of planets, every scrap of matter in the solar system was part of a gigantic nebula-a floating interstellar cloud. This giant cloud was made up of dust, hydrogen, and other gases. It began to collapse in on itself after becoming gravitationally unstable.

Detailed explanation-2: -Hydrogen and helium are thought to be the most prevalent elements in the primordial gas. The remaining two percent of elements in the original solar nebula included carbon, nitrogen, and oxygen. About one-fourth of the condensed material contained metals and silicate “rock.”

Detailed explanation-3: -Genesis : Search for Origins | JPL | NASA. Many cosmologists believe that the universe was created about 15 billion years ago with a cosmic explosion they nicknamed the Big Bang. This explosion produced an expanding cloud of the simplest known chemical elements: hydrogen (H) and helium (He) (see Figure 1).

Detailed explanation-4: -Answer and Explanation: According to the Nebular Theory, asteroids and comets in our Solar System are planetismals (meaning chunks of rock too small to be planets) that never became consolidated into any of the planets.