SSC Selection Post 2022 PYQ — Question 36

The correct answer is Option 1 i.e. By the accumulation of hydrogen gas in the form of a very large cloud called nebula

 

According to the Nebular Hypothesis, a galaxy forms through the accumulation of hydrogen gas and dust in the form of a massive cloud called a nebula. Over time, due to gravitational attraction, this cloud begins to collapse and condense. As it contracts, it starts to spin and flatten into a disk-like shape. Within this disk, matter continues to clump together, eventually forming stars, planets, and other celestial bodies. This process explains how solar systems and galaxies originate from nebulae. Hydrogen, being the most abundant element in the universe, plays a central role in this formation. The hypothesis does not involve oxygen accumulation or nuclear fission but emphasizes the gravitational forces acting on hydrogen-rich clouds in space.