Back to Home

General Forum Message

Forums: Atm · Astrophotography · Blackholes · Blackholes2 · CCD · Celestron · Domes · Education
Eyepieces · Meade · Misc. · God and Science · SETI · Software · UFO · XEphem
RSS Button

Home | Discussion Forums | Misc. Topics | Post

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
RE: Stud.

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Larry Usrey on August 15, 2000 15:26:07 UTC

They use a method called the doppler effect.
Just as when a train would be passing by you with it`s horn blasting you would hear it change pitches, light does the same thing. If the star is moving away from you the light in the spectrum is shifted to the red end and if it is moving towards you it is shifted to the blue end. The faster it is traveling the farther the shift is. Edwin Hubble discovered that the farther a object is the faster it is moving away from us and by using this information they are able to calculate somewhat the distance to various objects. There are still some questions about what is called the Hubble constant which has to do with the mass of the universe which will give the values for the distance/speed.
Hope this helps.
Clear skies,

Follow Ups:

    Login to Post
    Additional Information
    About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
    Unless otherwise specified, web site content Copyright 1994-2024 John Huggins All Rights Reserved
    Forum posts are Copyright their authors as specified in the heading above the post.
    "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET"
    are trademarks of John Huggins