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Star Systems and Galaxies

Galaxies and the Big Bang Theory. Star Systems and Galaxies. Galaxies. A Radio Telescope is a device used to detect long radio waves coming from objects in space. A galaxy is a huge group of single stars, star systems, star clusters,dust, and gas bound together by gravity

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Star Systems and Galaxies

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  1. Galaxies and the Big Bang Theory Star Systems and Galaxies

  2. Galaxies • A Radio Telescope is a device used to detect long radio waves coming from objects in space. • A galaxy 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 • Elliptical Galaxies • Irregular Galaxies

  3. Spiral Galaxies • The shape of a spiral galaxy is a bulge in the middle and arms that spiral outward like pinwheels • Many bright, young stars • Spiral galaxies contain gas and dust

  4. Elliptical Galaxies • Look like round or flattened balls • Billions of stars • Contain very little gas and dust between stars • Old stars because little gas or dust and no stars are forming any longer

  5. Irregular Galaxies • Galaxy without a regular shape • Smaller than other galaxies • Many bright, young stars • Lots of gas and dust to form new stars

  6. Milky Way • Our solar system is located in a spiral galaxy called the Milky Way.

  7. The Expanding Universe • Big Bang Theory • Universe formed in an instant • Billions of years ago • Enormous explosion • Universe is expanding • Leftover thermal energy from the big bang is cosmic background radiation Evidence that supports the Big Bang Theory -Hubble studied the light spectrum of distant galaxies and observed that it shifted toward the red end of the spectrum -Hubble compared a galaxies’ spectrum to its distance and found a red shift (object moving away=longer wavelength (red)

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