ESS
Grade-9
Easy

Question

The gravitational forces pulling the masses inwardly become_________ by the forces generated by nuclear fusion forcing outward.

  1. Protostar
  2. Red giant
  3. Balanced
  4. Unbalanced

hintHint:

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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