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Down: 1) A distance equal to 150 kilometers, or the distance from Earth to the sun2) Mercury, Venus, Earth, Mars4) A group of stars, dust, gas, and other objects held together by gravitational forces5) An object that orbits the sun but is too small to be considered a planet6) A meteor that passes through Earths atmosphere and strikes the ground.7) The sun, planets, moons, and other objects that are gravitationally bound to the sun8) An object in space made mostly of ice and dust9) Reactions which combine light elements such as hydrogen into heavier elements such as helium, releasing energy10) A cycle of rising and falling sea levels that repeats every 12 hours12) The repeating circular(or elliptical)path an object takes around a gravity source such as a planet or star Across: 3) A chunk of burning rock traveling through Earths atmosphere9) A mathematical rule that tells us how the strength of the force of gravity depends on mass and distance11) The spiral galaxy to which our solar system belongs13) A massive, round body held together by its own gravity that revolves around a star in its own orbit14) The distance light travels through space in one year. 9.46x10000000000000km15) Jupiter, Saturn, Uranus, Neptune16) An enormous hot ball of gas held together by gravity which produces energy through nuclear fusion reactions in its core17) Areas of gas that are cooler than the gases around them
 

 

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