Homogentiy

[tarak]

How homogenous is the universe? or How heterogenous is the universe??? Are there any patterns of variation across space and time???If so how do they relate to our present atate of knowledge ???

[maddog]

Tarak,

 

I think the best way is to contrast the data between the COBE (Cosmic Background Explorer) back in 1993

and WMAP in 2003. COBE was barely able to the variance in CBR (Cosmic Background Radiation). The

blotches were fuzzy. For WMAP the accuracy was close 10^ -5 K (100,000 of a Degree Kelvin) which

showed the differences clearly. This would imply more toward homogeneity than the opposite. Though

nothing is 100%. The importance here is that it is these imperfections or clumps that after the Big Bang

became the galaxies we see today. Without a little heterogeneity or difference you wouldn't get

galaxies. :cup:

 

Maddog

[tarak]

One intersting interpolation of theis homeogenity is the existence of another possibility called life some lightyears ahead of us.

[Bo]

the basic behind all modern cosmology is the so called cosological principle: this principle says that the universe as a whole can be considered homogeneous and isotropic (every point resp. every direction is equivalent).

 

Bo