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Question

The luminance and shape of some stars is not stable. These stars are called ____________.

A
Red Giants
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B
Super Nova
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C
Variable Stars
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D
Twin Stars
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Solution

The correct option is C Variable Stars
Variable Stars are constantly expanding or contracting. The luminance and shape of these stars is not stable. When these stars expand then they emit less energy and hence, brightness decreases. When they contract then its' surface temperature increases and hence, they appear brighter.

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