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Galaxies
Galaxy: a large grouping of stars
Photo Credit: http://pixabay.com/en/centaurus-a-ngc-5128-galaxy-11190/
Types of galaxies that we will study:
● Spiral
● Barred
● Elliptical
Photo Credit:http://en.wikipedia.org/wiki/Whirlpool_Galaxy
Spiral Galaxies
● Flat pinwheel rotating
around a central bulge
● Spiral arms contain
gas, dust, and young
stars
Photo Credit: http://en.wikipedia.org/wiki/Spiral_galaxy
Barred Galaxies
● Arms wind away from
a central bar, rather
than from a central
bulge
● ⅓ of all galaxies
● Type of spiral galaxy
● The Milky Way is a
Barred Spiral galaxy
Photo Credit: https://www.flickr.com/photos/hubble-heritage/3200045708/
Elliptical Galaxies
● Stars rotate in a random
fashion, rather than
around a central bulge
● Slow rotation
● Less gas and dust
● Very little star formation
● Dominated by older stars
Photo Credit: https://www.flickr.com/photos/badastronomy/3110808117/
References
Sea and Sky. (2013). Galaxies. Sea and
Sky. Retrieved April 14, 2014, from
http://www.seasky.org/celestial-objects/galaxies.html

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Galaxies

  • 2. Galaxy: a large grouping of stars Photo Credit: http://pixabay.com/en/centaurus-a-ngc-5128-galaxy-11190/
  • 3. Types of galaxies that we will study: ● Spiral ● Barred ● Elliptical Photo Credit:http://en.wikipedia.org/wiki/Whirlpool_Galaxy
  • 4. Spiral Galaxies ● Flat pinwheel rotating around a central bulge ● Spiral arms contain gas, dust, and young stars Photo Credit: http://en.wikipedia.org/wiki/Spiral_galaxy
  • 5. Barred Galaxies ● Arms wind away from a central bar, rather than from a central bulge ● ⅓ of all galaxies ● Type of spiral galaxy ● The Milky Way is a Barred Spiral galaxy Photo Credit: https://www.flickr.com/photos/hubble-heritage/3200045708/
  • 6. Elliptical Galaxies ● Stars rotate in a random fashion, rather than around a central bulge ● Slow rotation ● Less gas and dust ● Very little star formation ● Dominated by older stars Photo Credit: https://www.flickr.com/photos/badastronomy/3110808117/
  • 7. References Sea and Sky. (2013). Galaxies. Sea and Sky. Retrieved April 14, 2014, from http://www.seasky.org/celestial-objects/galaxies.html