Question

the majority of nearby stars that astronomers can observe are main sequence stars because nearby stars formed in the same region as the sun and thus are the same type of star as our sun. the main sequence phase of a stars life is much longer than other phases. nuclear fusion keeps most stars from ever becoming a different type of star like a red giant. main sequence stars are brighter and easier to observe than other types of stars.

Explanation:

The main - sequence phase is the longest - lived stage in a star's life cycle. Stars spend a vast amount of time in this phase compared to other phases like the red - giant phase, which makes them more likely to be observed.

Answer:

The main sequence phase of a star's life is much longer than other phases.