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
