Hubble law

  • Thread starter Ellio
  • Start date
  • #1
19
1

Homework Statement:

none

Relevant Equations:

see the screenshot
Screenshot_20200317-031724_Samsung Internet.jpg

So tell me if I'm wrong, the left spectrum (white) and the right one (red) show spectra of two different galaxies (with different distances), right ?
Why is it possible to know the velocity of the red-shifted spectrum by comparing it to the left one ??
 

Answers and Replies

  • #2
Orodruin
Staff Emeritus
Science Advisor
Homework Helper
Insights Author
Gold Member
16,829
6,652
Homework Statement:: none
Relevant Equations:: see the screenshot

View attachment 258817
So tell me if I'm wrong, the left spectrum (white) and the right one (red) show spectra of two different galaxies (with different distances), right ?
Why is it possible to know the velocity of the red-shifted spectrum by comparing it to the left one ??
The spectra have the same shape so you can just look at what the wavelength shift is for one of the peaks or absorbtion lines.
 

Related Threads on Hubble law

  • Last Post
Replies
5
Views
2K
  • Last Post
Replies
9
Views
9K
  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
1
Views
216
  • Last Post
Replies
0
Views
119
Replies
2
Views
2K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
2
Views
3K
Replies
4
Views
629
  • Last Post
Replies
1
Views
2K
Top