orbit - to go around another object in space, axis - an imaginary line that goes from the north to the south pole, rotation - to spin on its axis, sun - a middle sized star that is the center of our solar system, atmosphere - pocket of air that surrounds the earth, crust - solid rock that makes up the outer layer of the earth, mantle - the layer of hot flowing rocks beneath earth's crust, core - the center of the earth, tide - the rise and fall of the water level of the ocean caused by the pull of gravity of the moon, lunar cycle - the process of the moon changing phases, solar system - the sun and all the objects that orbit it, star - an object in space that makes its own heat and light, corona - sun's atmosphere, sunspot - an area on the sun that is cooler and appears darker, solar flare - a large explosion in the sun's atmosphere, solar energy - energy from the sun, wind - moving air,

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