re: Why blue ? Is it blue shift or something else?

Space/Science » in reply to re: disk of blue stars around black hole in M31

Johannes — 9/21/2005 3:45:49 PM (archived)

The blue stars seem to be in the foreground in the picture, if they are moving towards us at very high velocity then they would be blue.
How fast would the stars need to move to be that blue?

The whole thread (6 posts)

HST discovers disk of blue stars around black hole in M31 - LJK - 9/20/2005 7:01:01 PM
- More than meets the eye - Nick Hoffman - 9/21/2005 8:43:39 AM
- re: disk of blue stars around black hole in M31 - Raoul - 9/20/2005 7:51:58 PM
  - re: Why blue ? Is it blue shift or something else? - Johannes - 9/21/2005 3:45:49 PM
    - red giants do not appear red because they are rushing away from us at fantastic speed. - alcaray - 9/30/2005 4:47:09 PM
    - re: Why blue ? Is it blue shift or something else? - LJK - 9/30/2005 4:11:54 PM

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