Vocabulary
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, , 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, gravity, attract, mass, force, applied forces, contact force, non-contact force, distance, motion, strength, direction, push, pull, collide, collision, impulse, gravitational force, magnetic force, friction, position, orbit, gravity, force, asteroids, spherical, non-contact force, orbit, gravitational mass