SOLAR SYSTEM

Detailed explanation-1: -Nebulae are made of dust and gases-mostly hydrogen and helium. The dust and gases in a nebula are very spread out, but gravity can slowly begin to pull together clumps of dust and gas.

Detailed explanation-2: -The solar system is thought to have begun in a flattened disk of gas and dust referred to traditionally as the solar nebula. Such a construct seems to be a natural product of the collapse of dense parts of giant molecular clouds, the vast star-forming regions that pepper the Milky Way and other galaxies.

Detailed explanation-3: -Stars are born in dense clumps of gas, dust, and other material inside diffuse emission nebulae, also frequently referred to as “stellar nurseries". Hubble’s Pillars of Creation is in this category, as is the famous Orion Nebula ⁠-which you may well have seen for yourself through binoculars or a small telescope.

Detailed explanation-4: -The final class of galaxies consists of irregular galaxies. Irregular galaxies tend to contain lots of gas and dust. As a consequence, irregular galaxies contain copious star formation.

Detailed explanation-5: -The matter of a nebula is held together by the force of gravity. In most nebulas, there is a lot of space between the particles. In fact, nebulas are less dense than air! Thus, the gravitational attraction between the particles in a nebula is very weak.