Which is the correct evolutionary order
A)protostar, ZAMS, YSO
B)protostar, YSO, ZAMS
C)ZAMS, protostar, YSO
D)ZAMS, YSO, protostar

Question

Quizplus · Accepted Answer

The correct evolutionary order for a star formation is protostar, followed by a young stellar object (YSO), and then it finally reaches the zero-age main sequence (ZAMS). This is because a protostar is in its initial stage of formation and has not yet attained a stable equilibrium. The young stellar object is the stage where the star has ignited and started burning hydrogen in its core, but it is not yet in equilibrium on the main sequence. Finally, the zero-age main sequence is the stage where the star has reached a stable equilibrium, and hydrogen fusion in its core is the primary source of energy. Choice B correctly follows the order of star formation.

Which Is the Correct Evolutionary Order