Vocabulary
waning gibbous, waxing gibbous, waning crescent, waxing crescent, first quarter, last (third) quarter, new moon, full moon, autumn, spring, summer, winter, Northern Hemisphere, Southern Hemisphere, equator, solar system, gravity, revolution, equator, southern hemisphere, northern hemisphere, solstice, equinox, eclipse, umbra, penumbra,, lunar phase, orbit, rotate, revolve, phases of the moon, spring tide, neap tide, gravity, light pollution, nebulae, dark matter, black holes, telescope, Hubble telescope, orbits, elliptical, asteroids, comets, orbital motion, light year, radio astronomy techniques, Big Bang Theory, stars, nuclear fusion, supernova, protostar, stellar evolution, white dwarf, neutron star, black hole, blue giant, main sequence stars, fusion, red giant star, singularity, event horizon, spiral galaxies, elliptical galaxy, irregular galaxy, galaxy clusters, super clusters, solar system, planets, inner planet, gas giants, asteroids, comets, sun, hydrogen, helium, Milky Way Galaxy, galaxies, gravity, cluster, spiral galaxy, universe, light year, space telescopes, telescope arrays, x-ray telescopes, black hole, supernova, comet