Matching Pairs Galaxy Universe Review Online version Galaxy, Universe, Components of Universe Review by Andrea Soliz 1 Spiral Galaxy 2 blue shift 3 Galaxy 4 star 5 Big Bang Theory 6 Elliptical Galaxy 7 Irregular Galaxy 8 light year 9 red shift 10 Nebula the distance a single beam of light travels in one year. The unit of measurement used to measure the distance of objects in outer space. A system of billions of stars with dust and gas. The theory that our universe, which was once a small, dense ball of energy, exploded and expanded to create the universe we know today. the concept that an object is moving closer and closer. cloud of gas and dust in space that forms stars or is formed by the death of a star. the concept that an object is moving further away a hot ball of gas that burn elements like hydrogen and helium through the process of nuclear fusion.