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Different types of galaxies

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Different types of galaxies

  1. 1. Different types of galaxies<br />By: Samantha Derzay<br />
  2. 2. Classifying Galaxies<br />Spiral galaxies<br />Elliptical galaxies<br />Irregular galaxies <br />Lenticular<br />
  3. 3. Spiral Galaxies <br />A flattened disk of gas, and dust-rich material that orbits the nucleus of old red and yellow stars<br />Stars occur throughout the galaxy, but the brightest cluster of young blue and white stars are found in the arms<br />The stars and space objects rotate faster closer to the center than the ones father away<br />
  4. 4. Spiral Galaxies Classification <br />They are classified for how tightly together the arms of the galaxy are <br />The scale is Sa- Sd <br />Sa, is the most tight <br />Sd, is very loose <br />If the galaxy has a bar through the galaxy, the scale is SBa-SBd <br />
  5. 5. Elliptical Galaxies <br />They range from being the biggest to smallest galaxies <br />Scientist believe that there must be a lot of Dark Matter holding the stars together <br />Show little structure other than a simple sphere <br />Almost all of the stars yellow and red <br />Rarely any sign of star-forming gas and dust <br />
  6. 6. Elliptical Galaxies Classification <br />They are classified according to their shape <br />The scale is E0- E7 <br />E0 having the shape of a sphere <br />E7 having the shape of an oval <br />They are also classifies by their size<br />Giant Elliptical: located at the center of a galaxy clusters<br />Intermediate Galaxy<br />Dwarf Elliptical <br />
  7. 7. Lenticular Galaxies <br />At first they look like Elliptical, however around the nucleus there is gas<br />The gas would link them to Spiral galaxies, but the nucleus is considerably larger <br />The overall shape looks like a lens, which is the root word for Lenticular <br />If you were to look at a Lenticular galaxy face on, it could be mistakenly classified as a Elliptical galaxy <br />If you look at a Spiral galaxy with a large nucleus edge on, it could look like a Lenticular galaxy <br />
  8. 8. Irregular Galaxies <br />Galaxies that do not fit into Spiral, Elliptical, or Lenticular<br />These galaxies contain a lot of gas, dust, and blue stars<br />Many Irregular galaxies typically have great waves of star formation sweeping through the galaxy called “starbursts”<br />They frequently have vast, pink, hydrogen-emission nebulae where star formation is taking place<br />Some Irregular galaxies are colliding with other galaxies or being pulled apart by neighboring galaxies gravity<br />
  9. 9. The Milky Way Comparison<br />Classified as a SBc (barred spiral galaxy) <br />Diameter: 100,000 light years <br />Thickness: 1,000 light years <br />Mass: 700,000,000,000 M (M= solar mass) <br />Number of Stars: 100-400 billion <br />Oldest known star: 13.2 billion years <br />Andromeda is classified as a SAb <br />Number of stars: 1 trillion <br />Larger than the Milky Way<br />
  10. 10. Andromeda Galaxy <br />Classified as a SAb <br />

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