1) Used to measure distances outside our solar system a) Light Year b) Astronomical Unit c) Mile d) Kilometer 2) Smaller than a light year, the distance between Earth and the Sun a) Light Year b) Astronomical Unit c) Mile d) Kilometer 3) Billions of stars and their planets, dust, gas and empty space held together by gravity. a) Solar System b) Galaxy c) Universe d) Nebulae 4) Are clouds of dust and gas located in space formed from remains of large, dead stars that have either collapsed or exploded. Over time, the material (gas and dust) can come together to form stars and planets a) Solar System b) Galaxy c) Universe d) Nebulae 5) The brightness of a star as it appears from earth. Stars can appear brighter than another star is it is closer to us. a) Absolute brightness b) Apparent brightness c) Universe d) Nebulae 6) Celestial object that orbits a planet a) Star b) Moon c) Asteroid d) Comet 7) The force that keeps the Earth orbiting the sun a) Gravity b) Magnetism c) Mechanical d) Solar Radiation 8) Loops of gas that exit the sun and are pulled back to the sun a) Sunspots b) Nebulae c) Solar Flare d) Prominence 9) A collection of planets and moons that orbit around a star. Smaller than a galaxy a) Galaxy b) Solar System c) Asteroids d) Nebulae 10) The force of gravity on an object is measured in newtons. a) Mass b) Volume c) Weight d) System

8th Grade Unit 4 Vocabulary

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