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Space Systems

solar system a star and all of the objects that travel around it - planets, moons, asteroids, comets and meteoroids
satellite An object that revolves around another object in space (moon)
sun largest star in our solar system
gravitational pull in our solar system As planets move farther away from the sun, their gravitational pull towards it decreases.
Asteroid Belt the region of the solar system between the orbits of Mars and Jupiter, where many asteroids are found
Inner Planets Small, rocky planets that orbit closest to the sun including Mercury, Venus, Earth, & Mars
Outer Planets Gaseous planets that are past the Asteroid Belt including Jupiter, Saturn, Uranus, & Neptune (called Gas Giants)
scale model a copy of an object that is bigger or smaller than the real size of an object
gravity attractive force between any two objects; depends on the masses of the objects and the distance between them
galaxy a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity
orbit a regular, repeating path that one object in space takes around another one
Popular Science sets



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