The Sun will become a black dwarf when ___. A. the outer regions of the Sun expand B. it has used up all its fuel as a white dwarf C. the Sun moves nearer to the Earth D. the core of th

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The Sun will become a black dwarf when ___.

the outer regions of the Sun expand

it has used up all its fuel as a white dwarf

the Sun moves nearer to the Earth

the core of the Sun becomes hotter

Giải thích

Đáp án B

“After billions of years as a white dwarf, the Sun will have used up all its fuel and will have lost its heat. Such a star is called a black dwarf”