What must occur for an object to be considered a main sequence star?
A) Hydrostatic equilibrium
B) Nuclear fusion reaction in the core
C) Protostar life begins
D) Both a and b

Question

Quizplus · Accepted Answer

A main sequence star must maintain hydrostatic equilibrium, meaning that the inward force of gravity is balanced by the outward force of radiation pressure. This occurs when nuclear fusion reactions are happening in the core, converting hydrogen into helium and releasing energy. Therefore, both options A and B are necessary for an object to be considered a main sequence star. A main sequence star must be in hydrostatic equilibrium, which means that the forces pushing outward from fusion reactions in the core are balanced by the forces of gravity pulling inward. Additionally, a main sequence star must undergo nuclear fusion reactions in its core to generate the energy that keeps it shining. Therefore, both options A and B must occur for an object to be considered a main sequence star.

What Must Occur for an Object to Be Considered a Main