QuestionFebruary 3, 2026

A star spends most of its life in this stage: White dwarf Red giant Protostar Main sequence

A star spends most of its life in this stage: White dwarf Red giant Protostar Main sequence
A star spends most of its life in this stage:
White dwarf
Red giant
Protostar
Main sequence

Solution
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Answer

Main sequence Explanation A star spends the majority of its life in the "main sequence" stage. During this phase, the star is in a stable state where nuclear fusion of hydrogen into helium occurs in its core, providing the energy that makes the star shine. This stage is characterized by a balance between gravitational forces and the outward pressure from fusion reactions. The main sequence is the longest-lasting stage in a star's lifecycle, lasting for billions of years, depending on the star's mass.

Explanation

A star spends the majority of its life in the "main sequence" stage. During this phase, the star is in a stable state where nuclear fusion of hydrogen into helium occurs in its core, providing the energy that makes the star shine. This stage is characterized by a balance between gravitational forces and the outward pressure from fusion reactions. The main sequence is the longest-lasting stage in a star's lifecycle, lasting for billions of years, depending on the star's mass.
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