Which best describes stellar equilibrium?

O

A. The star produces fuel at the same rate it burns fuel.

O

B. The core contains equal amounts of hydrogen and helium.

O

c. Pressure caused by fusion reactions in the core is balanced by the

gravity exerted by the sun's mass.

O

D. Heat produced during fusion reactions in the core is transferred to

the surface.

the answer is B. The core contains equal amounts of hydrogen and helium.

Stellar equilibrium is also known by its other term hydrostatic equilibrium. A star is considered to be in equilibrium when the pressures located in the star balance out the force of gravity ... A star will remain in equilibrium until such time when the supply of hydrogen in the core is exhausted.

The correct answer is letter B.

Explanation: Even for the best studied star we can only measure 4 parameters: mass, luminosity, radius and chemical composition of the outer layers. We can determine the structure of the star with these parameters, because we have one more condition: the constancy of the stars over long periods of time. Even variable stars have long-term stability of the average structure. The existence of fossil algae on the earth over 1 billion years old and fossils up to 3.5 billion years old is evidence that the temperature of the earth cannot have changed by more than about 20 ° C. Therefore, the interior of the stars must be in perfect balance.