Back to Home

Blackholes 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 | Blackholes I | Post
Login

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
Hubble And Supernovae

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Richard Ruquist on April 8, 2002 14:31:21 UTC

Splat,
You are right in that if the universe is expanding at a constant rate, the stars that are further away will be at higher velocity- and as expressed by the Hubble constant, the velocity is proportional to distance on the average.
However, astronomers have found that Hubble's constant is not constant as you go back in time. From Supernovae observations, they have determined that much earlier in the life of the universe, the universe was actually expanding more slowly than now- at a different Hubble's constant. So the presumption is that the expansion of the universe is accelerating.
From this they deduce that a dark energy with an omega of 2/3rds fills the universe and causes it to expand. Coupled with light and dark matter having a combined omega of 1/3rd, the universe is now thought to be flat and expanding faster and faster- at any given distance, not as a function of distance.
Hope that clears up this misinterpretation of faster and faster.

Regards,

Richard

Follow Ups:

    Login to Post
    Additional Information
    Google
     
    Web www.astronomy.net
    DayNightLine
    About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
    Unless otherwise specified, web site content Copyright 1994-2020 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