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Name: __________________________________________ Galaxies and the Big Bang Theory Galaxies A _______________ _________________ is a device used to detect long radio waves from objects in space. A ___________ is a huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity The three different types of galaxies that exist in our universe are: • • • Spiral Galaxies The shape of a spiral galaxy is a bulge in the middle and arms that spiral outward like ______________. •Many bright, young stars •Spiral galaxies contain ____________ and _____________. Elliptical Galaxies •Look like _______________ or __________________ ______________. •Billions of stars •Contain very little _________ and ________ between stars. •Old stars because little gas or dust and no stars are forming any longer. Irregular Galaxies •Galaxy without a _____________ ________________. •Smaller than other galaxies •Many bright, young stars •Lots of gas and dust to form new stars Milky Way •Our solar system is located in a __________ called the Milky Way. ___________ The Expanding Universe •____________ _______________ Theory –Universe formed in an instant –Billions of years ago –Enormous explosion •Universe is expanding –Leftover thermal energy from the big bang is _______________ _______________ _________________________ Evidence that supports the Big Bang Theory: