What happens after star becomes red giant?

Answer 1

A star become a red giant when the core contracts, the temperature increases and the outer layers of the star begin to expand. By the end of this phase, the star can be 10 to 100 times it diameter. When the temperature in the core reaches 100 000 000°C, the helium start fusing into carbon. Because the star has expanded to such an enormous size, that the outer layer are much cooler than when the star was a main sequence star. It therefore appears red, earning the name of red giant.

Answer 2

A red giant has layers of gas, which is expelled into space. After the gas is over, a White dwarf is left. On average, the volume of these white dwarfs are equivalent to a regular planet. However, you have to keep in mind that a white dwarf forms, only when a regular star dies. When enormous stars die, it eventually leads to a silly pair of pants. Joking! It leads to a black hole. Hahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahhahaha!

Answer 3

Stars are always fighting against gravity, which tries to crush them inward. They fight back via nuclear fusion, where atoms in the core of the star are forced together through heat and pressure and combined into bigger atoms, releasing energy which acts like millions of atomic bombs, exploding and pushing everything else away. When a star uses up most of the lightest element in its core, it either gives in to gravity or starts fusing the next heavier element. The latter usually happens when the star momentarily shrinks (due to gravity) and then starts fusing at a faster rate than usual, flinging the outer layers of the star out with the extra outward force and making the star bigger as a result. Betelgeuse, a red super giant, is a good example of this.