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Why is it easier to measure overall structure of Andromeda Galaxy than

  1. Nov 20, 2003 #1
    Why is it easier to measure overall structure of Andromeda Galaxy than to measure Milky Way Galaxy?
     
  2. jcsd
  3. Nov 20, 2003 #2

    Labguy

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    Re: Measurement

    Because we can see the whole thing in visable light, and take neat photos, while it takes Radio and IR imaging to see through the dust and gasses blocking our view of most of our own Milky Way. Because we have to "see" our own galaxy edge-on, no neat spirel structure; we are in it.

    http://antwrp.gsfc.nasa.gov/apod/ap021021.html

    http://antwrp.gsfc.nasa.gov/apod/ap020719.html

    Labguy
     
    Last edited: Nov 20, 2003
  4. Nov 20, 2003 #3

    jcsd

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    It's like holding a book right up to your face edge on, you can certain aspects of it's structure quite cleraly but you can't really see the bigger picture, add to this all the interstellar gas around the galactic nuclei which makes that region very difficult to observe.
     
  5. Nov 21, 2003 #4

    Phobos

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    Welcome to Physics Forums, BFern!

    Note that it's easier to see Andromeda's overall structure, but harder to see the internal details (because it's so far away).
     
  6. Nov 21, 2003 #5

    Labguy

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    To add, and just for someone to look up if interested, somewhere on the web you can find an unbelievable photo of the giant elliptical galaxy M87. They say our Milky Way has about 150-200 Globular Clusters (I think more), but the photo of M87 shows good detail in the galaxy and ~10,000 (yes, ten thousand) globular clusters in the halo.

    Labguy

    EDIT: Here it is: (larger photo would be nice)
    http://www.seds.org/messier/Jpg/m87.jpg From:
    http://www.seds.org/messier/more/m-aat.html
    A "keeper"
     
    Last edited: Nov 21, 2003
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