1) A group of celestial objects bound together by gravitational attraction, usually in the form of a central star. a) Star System b) Galaxy c) Nebula d) Universe 2) A massive system of stars, star clusters, gas, dust, and dark matter, bound together by gravity. a) Star System b) Galaxy c) Nebula d) Universe 3) A cloud of gas and dust in space, often the birthplace of stars. a) Star System b) Galaxy c) Nebula d) Universe 4) The totality of known or supposed objects and phenomena throughout space. Theorized to be composed of Matter and Energy and Space. a) Star System b) Galaxy c) Nebula d) Universe 5) Terrestrial planets with a rocky composition. a) Inner planets b) Outer Planets c) Universe d) Star System 6) Gas and ice giants with predominantly gaseous compositions. a) Inner Planets b) Outer Planets c) Universe d) Star System

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