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