ESS
Grade-9
Easy
Question
The gravitational forces pulling the masses inwardly become_________ by the forces generated by nuclear fusion forcing outward.
- Protostar
- Red giant
- Balanced
- Unbalanced
Hint:
The outward energy flow due to the fusion reaction is balanced by the gravity pulling the mass together.
The correct answer is: Balanced
- In the Main Sequence Phase of a star's evolution, radiation pressure pushing outward exactly balances the gravitational pressure pulling inward (this balance is called Hydrostatic Equilibrium).
- Because these two forces are exactly in balance, the star is stable (this means it neither shrinks nor expands).
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