Vocabulary
solar system, solar nebula, Nebular Theory, comet, planet, moon, meteors, asteroids, dwarf planets, celestial bodies, elliptical orbit, gravity, inertia, nuclear fusion, outer planets, inner planets, solar system, meteoroids, elliptical orbit, outer planets, comet, inertia, gravity, satellites, Asteroid Belt, asteroids, moon, inner planets, dwarf planets, sun, solar system, inner planets, rover, satellites, asteroid belt, dwarf planets, meteorites, telescope, gravitational force, orbit, comet, elliptical trajectory, moon, satellite, orbit, Phases of the Moon, Lunar Phases, new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, last quarter, waning crescent, Lunar cycle (29.5 days),, sun, shadow, moon, day, night, pattern, seasons, winter, spring, summer, autumn, rotates, solar system, planets, inner planet, gas giants, asteroids, comets, sun, hydrogen, helium