RISE Science - Earth Science Practice Questions - RISE Science - High School Earth Science Exam

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A main sequence star maintains a stable size and structure for billions of years. Which internal equilibrium condition prevents the star from collapsing under its own gravity or expanding uncontrollably?

Thermal expansion balancing planetary tidal forces Inward gravitational force balancing outward thermal radiation pressure from nuclear fusion Centrifugal force from rotation balancing magnetic field repulsion Electron degeneracy pressure balancing solar wind ejection

Correct Answer:

Inward gravitational force balancing outward thermal radiation pressure from nuclear fusion

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