Vocabulary
solar system, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, comets, moons, meteoroids, asteroids, dwarf planet, gravity, orbit, telescopes, orbiters, landers, tides,, solar system, galaxy, Milky Way, light year, stars, gravity, galaxy, gravity, spiral galaxy, constellation, spiral galaxy, elliptical galaxy, irregular galaxy, light year, atmosphere, gravity, orbit, galaxy, asteroids, Milky Way Galaxy, stars, moons, planets, nebulae, dark matter, black hole, spiral, elliptical, irregular, light year, telescope, dwarf planet, comets, asteroids, gravity, velocity, orbital, lander, rover, telescope, ocular, finderscope, tripod, solar system, asteroid belt, gravity, 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