Vocabulary
planet, solar system, Earth , Mars, Jupiter, Saturn, Neptune, Uranus, Mercury, Venus, moon, rotate, Galileo, astronomical, sun, gas giant, satellite, moon, sun, star, solar system, plasma, galaxy, orbit, atmosphere, satellite, moon, diameter, rotation, lunar surface, axis, day, night, North pole, South pole, phases of the moon, last quarter, waning gibbous, waxing gibbous, waning crescent, waxing crescent, full moon, new moon, dwarf planet, comets, asteroids, gravity, velocity, orbital, lander, rover, telescope, ocular, finderscope, tripod, solar system, asteroid belt, gravity