A star's lifespan is primarily determined by its mass and luminosity (rate of energy output, which is proportional to the rate of nuclear reactions). More massive stars have more fuel but burn it much faster due to higher core temperatures and pressures, resulting in shorter lives. Less massive stars burn their fuel slowly and live much longer. Giant stars are typically more massive and much more luminous than dwarf stars.
Consider the following statements : Statement-I : Giant stars live much longer than dwarf stars. Statement-II : Compared to dwarf stars, giant stars have a greater rate of nuclear reactions. Which one of the following is correct in respect of the above statements ?
Asked in UPSC IAS 2024 · Topic: Space (Stellar Structure, Evolution, and Nucleosynthesis)
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Answer: D. Statement-I is incorrect, but Statement-II is correct
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