What phase of stellar life does the Main Sequence primarily represent?
Answer
The stable phase of hydrogen fusion in the core.
The Main Sequence is the most prominent feature on the H-R diagram, appearing as a strong diagonal band stretching from the upper-left to the lower-right regions. Stars found here constitute approximately 90 percent of all observed stars, including our Sun. This position signifies the most stable and longest period of a star's existence, characterized by the continuous and active fusion of hydrogen into helium within its core. A star's specific position along this sequence is critically determined by its mass: more massive stars are hotter and more luminous (upper-left), while less massive stars are cooler and dimmer (lower-right).
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