SOLAR SYSTEM

Detailed explanation-1: -As the core collapses, the shell of plasma surrounding the core becomes hot enough to begin fusing hydrogen itself. As fusion in this shell begins, the extra heat causes the outer layers of the star to expand dramatically, and the surface extends up to several hundred times beyond the former size of the star.

Detailed explanation-2: -Spectral types are a measure of the surface temperatures of stars and are letter designations: O, B, A, F, G, K, and M. Type O stars have the highest surface temperatures and can be as hot as 30, 000 Kelvins. On the other extreme, type M stars have the lowest surface temperatures and can be as cool as 3, 000 K.

Detailed explanation-3: -High Mass Main Sequence Star This means that higher mass stars fuse hydrogen to helium much faster than lower mass stars, resulting in hotter surfaces temperatures and higher luminosities. High mass stars have a higher amount of hydrogen in their core when starting their life.

Detailed explanation-4: -When a star runs out of helium, its core will start collapsing again until its temperature is high enough to begin fusing carbon. This pattern will continue as the star burns through successively heavier materials: carbon, neon, oxygen and silicon. This gives the star a layered structure, similar to an onion.