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GALAXIES

Learn about galaxies, huge collections of stars, gas, and dust held together by gravity. Discover the classification of galaxies by Edwin Hubble and the different types, such as elliptical, spiral, barred spiral, and irregular.

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GALAXIES

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  1. GALAXIES

  2. What is a galaxy? • Galaxies are huge collections of stars, gas and dust held together by gravity.

  3. Galaxy Background Info • The first galaxies were identified as far back as the 17th Century by a French Astronomer called Charles Messier. • Messier compiled a list of 110 star clusters which he discovered while searching the sky for comets.

  4. Edwin Hubble • In the 1920's Edwin Hubble measured the distance to one of these star clusters. • Proved it was located outside our galaxy. • First to classify galaxies.

  5. Today we use Hubble’s Tuning Fork Diagram to classify galaxies.

  6. Types of Galaxies • Elliptical • Spiral • Barred Spiral • Irregular

  7. ELLIPTICAL • Very little dust and gas • Contains primarily old, red stars • Vary is size

  8. Elliptical

  9. SPIRAL • 2 Distinct Regions • Disk • Contains spiral arms • Region of star formation • Large amount of gas and dust • Bulge • Devoid of gas and dust • composed primarily of Population II stars

  10. Barred Spiral

  11. IRREGULAR • do not fit into either the spiral or elliptical classes • wide variety of shapes and characteristics • The result of collisions between galaxies or gravitational interactions between galaxies.

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