Question

When does a star reach equilibrium?

Answer 1

Actually, that does not happen until the protostar becomes a star when nuclear ignition starts and is maintained. It takes awhile for new star to go through its T-Tauri stage and settle down on the main sequence. 

A STAR does not reach hydrostatic equilibrium until it on the main sequence. Otherwise, it would remain a brown dwarf with not enough mass to to maintain nuclear fusion for more than 3,000 to 10,00 years. 

Answer 2

Answer:

The correct answer is when gravity is balanced by the outward force of nuclear fusion hopefully this helps!