GENERAL KNOWLEDGE

Detailed explanation-1: -Hydrogen and helium are estimated to make up roughly 74% and 24% of all baryonic matter in the universe respectively. Despite comprising only a very small fraction of the universe, the remaining “heavy elements” can greatly influence astronomical phenomena.

Detailed explanation-2: -Today hydrogen is estimated to account for 90% of all atoms in the universe, and it is essential to the material world.

Detailed explanation-3: -The data indicates that hydrogen and helium make up nearly all of the nuclear matter in the universe. The most abundant element, hydrogen, accounts for 74% of the mass while helium contributes 25%. Heavier elements comprise less than 1% of the total.

Detailed explanation-4: -Hydrogen makes up about 70% of the universe by mass, which makes it by far the most abundant element. In stars like the sun, hydrogen atoms collide to create Helium atoms, which is a fusion reaction.