1) which of the following is not a dwarf planet? a) eris b) pluto c) ceres d) io 2) what are the three types of galaxies? a) circular, elongated, spiral b) irregular, centered, barred c) spiral, elliptical, irregular d) regular, spherical, sprial 3) experiments show that light behaved like as it travels through space a) sound b) gravity c) charged particles d) waves and particles 4) which stars are located in the lower left of the h-r diagram because they are hot but not very bright? a) red giant b) neutron stars c) white dwarfs d) main sequence 5) how can astronomers locate objects in the sky? a) by using altitude and zenith b) by using latitude and longitude c) by using distance and compass directions d) by using the celestial sphere and constellations