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B Stars in other Andromeda

  1. Apr 11, 2016 #1
    Dear PF Forum,
    Just out of curiosity :smile:
    Can we (through telescope or HST for example) see stars in Andromeda Galaxy?
    Is the Andromeda Galaxy the closes galaxy to us. Can we really be sure that there is no other galaxy accross Milky Way because our line of sight is blocked by clusters of stars in Milky Way.

  2. jcsd
  3. Apr 11, 2016 #2

    Fervent Freyja

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  4. Apr 11, 2016 #3
    Yes, until Edwin Hubble, nobody were Andromeda was. He correctly identified a cepheid variable on it's otter rim. He could do it in the early 1900, now high power telescopes, it's fairly easy.
  5. Apr 11, 2016 #4
    Do you mean HST can spot individual stars in Andromeda, as we say observe Vega, 26 ly away?
  6. Apr 11, 2016 #5
    Yes, in fact, you can see some of the brightest in this 1.5 billion pixel image: http://www.spacetelescope.org/images/heic1502a/zoomable/

    The big ones are much closer Milky Way stars, but when you zoom in, you can see individual stars in Andromeda itself.

    How much detail they can study them in is obviously no where near the ability to look at close stars but it's certainly possible to pick out individual ones.

    Hubble's record for precision is 0.0003 arc-seconds according to Wikipedia, to put that in context, that's the width of a dime held a distance of more than 3000 miles.
    Last edited: Apr 11, 2016
  7. Apr 11, 2016 #6
    If I don't know PF Forum better, I'd say this is a computer generated software.
    Ok, my curiosity fullfiled.
  8. Apr 11, 2016 #7


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    I am pretty sure it's safe to say that almost ALL the individual stars visible in the UNZOOMED image are foreground stars in our galaxy
    Last edited: Apr 11, 2016
  9. Apr 12, 2016 #8
    Certainly so.
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