Respuesta :

Answer:

When the inner core shrinks and the outer atmosphere expands thereby giving red color to the star.

Explanation:

When the hydrogen with in the core of a  star gets exhausted, the nuclear reactions taking place in the inner core move outwards towards the atmosphere of the star in search of fuel. Due to this, the star expands and become cool and red. This process continues till the star convert into red giant and all the available fuel (hydrogen) is consumed.  

Due to expanding atmosphere,  the inner core starts shrinking due to gravity. The pressure and temperature also increases  in the middle till nuclear fission starts again but this time it will use helium instead of hydrogen.

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You can determine a star is about to turn into a red giant when it is in its main sequence stage where it is expected to continuously fuse hydrogen to helium which generates light and heat, but stops fusion as a result of running out of hydrogen fuel in its core.

Further Explanation

The moment fusion stops, gravity takes places and this will lead to the compression of the star into a smaller and tighter unit. Hence it stops being a main sequence star, and automatically becomes a Red Giant.

A star usually commences its existence as huge ball of gas, and pass through various stages in its lifetime to end as its remnants. The life cycle of a star is in seven stages which are: the Giant gas cloud stage, the Protostar stage, the T-Tauri stage, the Main sequence star stage, the evolution into Red Giant stage, the fusion into Heavier Elements stage and the Supernovae stage.

Basically, a red star giant is a dying star. A star spends most of its lifetime as a main sequence star before transforming into a red giant. When a main sequence star exhausts its hydrogen, it is ready to become a red giant, and as such, temperature within and the outer of the stellar core begins to increase as a result of the collapse of core propelled by gravity.  

LEARN MORE:

  • determine that a star is about to turn into a red giant https://brainly.com/question/12649111

KEYWORDS:

  • red giant
  • t-tauri stage
  • hydrogen
  • helium
  • cloud stage

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