SOLAR SYSTEM

Detailed explanation-1: -Over millions of years, giant molecular clouds are prone to collapse and fragmentation. These fragments then form small, dense cores, which in turn collapse into stars. The cores range in mass from a fraction to several times that of the Sun and are called protostellar (protosolar) nebulae.

Detailed explanation-2: -About 4.6 billion years ago our solar system formed from a cloud of gas and dust which slowly contracted under the mutual gravity of all of its particles. The cloud was made largely of hydrogen (H) with some helium (He) and small amounts of the remaining naturally occurring chemical elements.

Detailed explanation-3: -Comets, asteroids, and meteorites discovered on Earth provide evidence to support the nebular theory.

Detailed explanation-4: -The nebular hypothesis is the possible explanation for how the Sun, the Earth, and the rest of the solar system formed approximately 4.6 billion years ago out of the gravitational collapse of a large cloud of gas and dust left behind from previous star formation and star life cycles.

Detailed explanation-5: -Star Formation As the cloud collapses, the material at the center begins to heat up. Known as a protostar, it is this hot core at the heart of the collapsing cloud that will one day become a star.