Stellar characteristics refer to the properties that define stars, including their size, temperature, brightness, and composition. These features help astronomers classify stars into different types, such as main sequence, giants, and dwarfs. The temperature of a star affects its color, with hotter stars appearing blue and cooler stars appearing red. Another important aspect of stellar characteristics is a star's life cycle, which includes stages like nebula, main sequence, and supernova. The mass of a star determines its lifespan and ultimate fate, influencing whether it will become a white dwarf, neutron star, or black hole. Understanding these characteristics is essential for studying the universe.