1) the distance between Earth and the sun, about 93 million miles (150 million km) a) astronomical unit (au) b) universe c) nebula d) interstellar gas and dust 2) a hypothetical form of energy that influences the universe a) solar system b) plasma c) dark energy d) galaxy 3) a hypothetical form of matter that is not visible but influences the structure of galaxies a) orbit b) dark matter c) planet d) light-year 4) gas and dust between stars a) interstellar gas and dust b) speed of light c) astronomical unit (au) d) galaxy 5) the distance a particle of light travels in one year; 5.88 trillion mi (9.46 trillion km) a) planet b) speed of light c) light-year d) star 6) a giant cloud of interstellar gas and dust a) nebula b) star c) light-year d) astronomical unit (au) 7) a state of matter that is so hot that it becomes a charged form of gas a) dark matter b) plasma c) universe d) dark energy 8) a constant unit that shows how fast photons travel through space, about 186,000 miles (300 million meters) per second a) star b) speed of light c) light-year d) planet 9) a massive ball of gas in outer space that emits heat a) star b) solar system c) dark matter d) interstellar gas and dust 10) the circular path of an object when it revolves around another object a) dark energy b) plasma c) speed of light d) orbit 11) a group of solar systems, dust, and gas held together by gravity a) nebula b) astronomical unit (au) c) galaxy d) interstellar gas and dust 12) all matter and space a) plasma b) universe c) star d) astronomical unit (au) 13) a system of objects that revolve around a star a) solar system b) plasma c) galaxy d) dark matter 14) a large spherical mass that revolves around a star a) speed of light b) solar system c) planet d) dark energy

Introduction to the Universe

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