galaxies often contain hundreds of billions of stars
galaxy is enormous_group_of_stars. stars is millions_of_light_years_away. star has much_more_mass_than_planet milky_way has about_100,000,000_stars_in variable_star is star. star_of_bethlehem is astronomical. the is billions_of_stars_in_sky. universe has sun_and_earth giant_star is star.