* Main Sequence Lifetime: A star with 1.2 solar masses will have a main sequence lifetime of approximately 7.5 billion years.
Explanation:
* Main Sequence: This is the longest and most stable phase in a star's life, where it fuses hydrogen into helium in its core.
* Mass and Lifetime: A star's mass is the primary factor determining its lifespan. More massive stars burn through their fuel much faster than less massive stars. This is because they have stronger gravity, leading to higher core temperatures and pressure, which accelerate nuclear fusion.
Comparison to the Sun:
* The Sun, with a mass of 1 solar mass, has a main sequence lifetime of about 10 billion years.
* Since a 1.2 solar mass star is slightly more massive, it will burn through its fuel faster, resulting in a shorter main sequence lifetime.
Important Note: This is an approximate lifespan. Other factors can influence a star's life, such as its composition and the presence of a binary companion.
