Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Redshift, Blueshift

  1. Apr 24, 2005 #1
    :surprised Since we have been taken readings of redshift, blueshift for sometime now, is there a concensus on a percentage of each?
     
  2. jcsd
  3. Apr 24, 2005 #2
    You need to be a LOT more specific. If you mean measurements of cosmological expansion, all measurements are redshifted. If you mean the local volume, then they are dependent on local motions and I don't know the mix.

    What are you asking?
     
  4. Apr 24, 2005 #3
    novice at astronomy

    In short I guess what I'm trying to ask is , besides the Andromeda galaxy, are there any other large bodies coming our way, or are they all expanding outward from us?
     
  5. Apr 25, 2005 #4
    I believe there are at least another two galaxies approahing us.
    They are fairly local.
    You could try nasa site or NED, to ask your question.
     
    Last edited by a moderator: Apr 25, 2005
  6. Apr 29, 2005 #5
    NED lists 2189 blue-shifted objects.
     
  7. May 4, 2005 #6

    Phobos

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Seems that the Milky Way is already colliding with another galaxy and there are a few more on the way.
    http://curious.astro.cornell.edu/question.php?number=386

    The Andromeda galaxy collision will just be much more significant.

    The Milky Way is part of a "Local Group" of galaxies which are not expanding away from each other (galaxies tend to be found in clusters).
    http://www.seds.org/messier/more/local.html
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Redshift, Blueshift
  1. Experiments in redshift (Replies: 14)

  2. The redshifted photon (Replies: 14)

  3. Finding the redshift (Replies: 17)

  4. Redshift (Replies: 1)

Loading...