Why is the fate of all-star?

Answer 1

Your question is not very clear, so i will answer according to my understanding.

There are different types of stars, all different in size and composition. Regardsless of this fact, one commonality exist between all stars, eventually they run out of fuel. Super massive stars are the largest in the universe and they consume their fuel very quickly after which they will detonate as supernovae; completely disintegrating themselves in the process.

The longest living stars are Red Dwarfs. Red dwarf stars are the most common kind of stars in the Universe. These are main sequence stars but they have such low mass that they're much cooler than stars like our Sun. They have another advantage. Red dwarf stars are able to keep the hydrogen fuel mixing into their core, and so they can conserve their fuel for much longer than other stars. Astronomers estimate that some red dwarf stars will burn for up to 10 trillion years. The smallest red dwarfs are 0.075 times the mass of the Sun, and they can have a mass of up to half of the Sun.