michel123456 Posted November 20, 2012 Share Posted November 20, 2012 When observing galaxies, astronomers are able to measure their relative velocity to us. How do they measure the eventual lateral velocity when the galaxy motion is not directly aligned with us? Link to comment Share on other sites More sharing options...
michel123456 Posted November 21, 2012 Author Share Posted November 21, 2012 Do astronomers measure lateral velocity at all ? Link to comment Share on other sites More sharing options...
michel123456 Posted November 21, 2012 Author Share Posted November 21, 2012 I am wasting my time here. Link to comment Share on other sites More sharing options...
Airbrush Posted November 21, 2012 Share Posted November 21, 2012 When observing galaxies, astronomers are able to measure their relative velocity to us. How do they measure the eventual lateral velocity when the galaxy motion is not directly aligned with us? Outside our Virgo Supercluster there is hardly any lateral motion. All other superclusters are moving away from us. I suppose the method they use to measure galactic rotation could also be used to measure lateral motion of galaxies within our supercluster. Anyone know how they measure galactic rotation speed? Link to comment Share on other sites More sharing options...
michel123456 Posted November 22, 2012 Author Share Posted November 22, 2012 Outside our Virgo Supercluster there is hardly any lateral motion. All other superclusters are moving away from us. I suppose the method they use to measure galactic rotation could also be used to measure lateral motion of galaxies within our supercluster. Anyone know how they measure galactic rotation speed? That is exactly my question: how do we know that? How do astronomers measure lateral motion? Link to comment Share on other sites More sharing options...
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