Vocabulary
phases, moon, satellite, solar system, waxing, waning, crescent, gibbous, quarter, cycle, orbit, eclipse, 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, gravity, gravitational force, mass, distance, magnitude, direction, solar system, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, comets, moons, meteoroids, asteroids, dwarf planet, gravity, orbit, telescopes, orbiters, landers, tides,, electrical force, magnetic force, gravitational force, force field, gravity, mass, charged particles,
force, acceleration, direction, gravity, mass, weight, orbit, inertia, gravitational force, planets
, 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, gravity, mass, asteroids, repulsive, attractive, magnitude, weight, acceleration, orbit, solar system, galaxy, Milky Way, light year, stars, gravity, galaxy, gravity, spiral galaxy, constellation, spiral galaxy, elliptical galaxy, irregular galaxy, light year