SOLAR SYSTEM

Detailed explanation-1: -Stars are made up of very hot gases. These gases are mostly hydrogen and helium, which are the two lightest elements. Stars shine by the fusion of hydrogen and helium in their cores.

Detailed explanation-2: -Hydrogen is by far the most abundant element in the universe. It constitutes roughly 90 percent of atoms in the Sun and in most stars. Helium ranks second, with nearly 9 percent. This leaves only 1 percent of the atoms remaining for the rest of the periodic table of elements.

Detailed explanation-3: -Main sequence stars are relatively young stars that contribute  95% of the stars in the universe. These stars fuse hydrogen into helium and generate great amounts of energy.

Detailed explanation-4: -Light elements like hydrogen and helium formed during the big bang, and those up to iron are made by fusion in the cores of stars. Some heavier elements like gallium and bromine need something more, such as a supernova.

Detailed explanation-5: -You might not be surprised to know that stars are made of the same stuff as the rest of the Universe: 73% hydrogen, 25% helium, and the last 2% is all the other elements.