RED GIANT

BBC Earth (Asia) - - Update -

Even­tu­ally the hy­dro­gen in the core be­gins to run out. Now, hy­dro­gen be­gins to fuse into he­lium in the star’s outer lay­ers, caus­ing

it to ex­pand. Depend­ing on the

star’s mass, it be­comes a red giant

or su­per­giant.

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