Question

20. When the hydrogen supply in the core begins to run out, and the star is no longer generating heat by nuclear fusion, the core becomes unstable and contracts. The outer shellof the star, which is still mostly hydrogen, starts to expand. At this phase the star is called a _____.
a.White dwarf
b.Red dwarf
c.Red Giant
d.Black hole

Answer 1

Answer:

b

Explanation:

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