Different types of galaxies
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Different types of galaxies

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um...different types of galaxies?

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    Different types of galaxies Different types of galaxies Presentation Transcript

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