SCIENCE
EARTH SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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main-sequence
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white dwarf
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supernova
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red giant
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Detailed explanation-1: -Answer: The main sequence (SP) is the longest stage of the star’s life, when it is fusing hydrogen into helium in the core and glowing steadily, in hydrostatic equilibrium.
Detailed explanation-2: -The start of hydrogen fusion marks the birth of a star. The active fusion stage is the longest stage in the life cycle of a star. This stage can last for billions of years. The active fusion stage ends when a star runs out of hydrogen.
Detailed explanation-3: -Red Dwarfs: The Most Common and Longest-Lived Stars.
Detailed explanation-4: -Main-sequence stars are fusing hydrogen into helium. These nuclear fusion take place deep in the cores of stars. Stars spend about 90% of their lives in this stage. Our Sun is about 5, 000 million years into its 10, 000 million-year main-sequence.