GENERAL KNOWLEDGE

Detailed explanation-1: -A red giant is a star that has exhausted the supply of hydrogen in its core and has begun thermonuclear fusion of hydrogen in a shell surrounding the core.

Detailed explanation-2: -Once there is no fuel left, the star collapses and the outer layers explode as a ‘supernova’. What’s left over after a supernova explosion is a ‘neutron star’ – the collapsed core of the star – or, if there’s sufficient mass, a black hole.

Detailed explanation-3: -White Dwarfs In stars up to one and a half times more massive than the Sun, the star’s core eventually runs out of helium to fuse into carbon. Its outer layers blow away into space one at a time over about 10, 000 years and become a planetary nebula.

Detailed explanation-4: -If the star is big enough to fuse hydrogen atoms into helium, it will enter the phase that our Sun is in, called the main sequence phase. A star will enjoy most of its life in the main sequence phase. At this point nuclear fusion is turning hydrogen into helium.