Vocabulary
, 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, irregular, elliptical, spiral, gravity, galaxy, Milky Way, solar system, Hubble Telescope, barred spiral, reflecting, refracting, optical telescope, open cluster, globular telescope, O.B. stars, differential rotation, light year, orbit, x-ray telescope, radio telescope, Milky Way Galaxy, galaxies, gravity, cluster, spiral galaxy, universe, light year, space telescopes, telescope arrays, x-ray telescopes, black hole, supernova, comet