Terrestrial - another word for "rocky", Asteroid - rocky object that orbits the Sun, mostly found in the asteroid belt between Mars and Jupiter, Earth - The planet we live on, the third planet from the Sun., orbit - The path an object takes as it moves around another object in space, Solar system - The Sun and everything that orbits it, including planets, moons, asteroids, and comets., Satellite - An object that orbits a planet., universe - Everything that exists, including all galaxies, stars, planets, and space., gravity - The force that pulls objects toward each other, Milky way - The galaxy that contains our solar system, Nebula - A giant cloud of gas and dust in space where new stars can form, axis - An imaginary line through the center of a planet that it spins around., equator - An imaginary line around the middle of the Earth, dividing it into the Northern and Southern Hemispheres., hemisphere - Half of a sphere, like half of the Earth, Nuclear Fusion - a process that releases heat and light energy - the formation of a star,

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