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a collection of stars, dust, and gas bound together by gravity? galaxy a large cloud of dust and gas in interstellar space nebula a region in space where stars are born or where stars explode at the end of their lives? interstellar space a tight group of stars that looks like a ball and contains up to 1 million stars? globular cluster a group of stars that are close together relative to surrounding stars? open cluster a very luminous, starlike object that generates energy at high rates quasar What are thought to be the most distant objects in the universe? quasar Who classified galaxies according to their shape? Edwin Hubble What are the galaxies in order of decreasing size? Giant elliptical galaxy; spiral galaxy, irregular galaxy and dwarf elliptical galaxy The major difference between an Elliptical Galaxy and a Globular Cluster is that the Globular Cluster can be inside an Elliptical Galaxy - it is part of a Galaxy and not a Galaxy itself. What has usually bright centers and has very little dust and gas. Elliptical galaxy What is a group of stars that looks like a ball and contains up to 1million stars and is inside of a galaxy. Globular cluster By the time the light of the star reaches you the star might be gone because? the light has traveled over millions to billions years ago. What's our galaxy? Milky Way