galaxies are usually thousands of light years in diameter
light_minute is astronomy_unit. stars is millions_of_light_years_away. light_hour is astronomy_unit. andromeda_galaxy is over_2.2_million_light_years_away. galaxies has spiral_shape universe is largers_than. earth is billions_of_years_old. light_second is astronomy_unit. galaxies has elliptical_shape light_year is astronomy_unit.