1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Hubble's work

  1. Oct 13, 2011 #1
    hello

    Can someone please clarify a point about Hubble's work?:

    By using cepheids Hubble showed that the so called "nebulae" were too distant to be contained within our galaxy. My question is the following: is it only with the buidling of the 100-inch telescope that they were able to resolve the "nebulae" into individual stars and so then focus on the cepheids?
    ie. before the 100-inch telescope, the other galaxies were too far away to resolve into individual stars which is why they were mistaken for nebulae.

    And to drive the point home - Was there any instance before the use of the 100-inch that individual stars could be resolved in other galaxies?
     
  2. jcsd
  3. Oct 13, 2011 #2

    phyzguy

    User Avatar
    Science Advisor

    I think you are correct. Before the Mt. Wilson 100 inch telescope, there was debate as to whether the "spiral nebulae" were so-called "island universes" (which we today call galaxies), or whether they were nebulae within our own galaxy. Hubble and Humason used the 100" to resolve Andromeda into stars and identify Cepheid variables within it, thereby measuring its distance. This showed that the spiral nebulae were in fact separate galaxies.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Hubble's work
  1. Hubble volume (Replies: 8)

Loading...