How do physicists use redshift to determine the expansion of the universe?

[Arifz]

But, is there such thing as infinite in physics?

 

[hitchiker]

But, is there such thing as infinite in physics?

only one thing is infinite, that is universe...the emptiness

physics is to deal with singularities like matter energy stuff like that which spawned out of nowhere in the emptiness

Bigger picture of universe go beyond physics

 

[GeorgeDishman]

But, is there such thing as infinite in physics?

Temperature:

http://en.wikipedia.org/wiki/Negative_temperature#Heat_and_molecular_energy_distribution

 

[GeorgeDishman]

I like this view of time. Everyone, everywhere would measure the age of the CMBR to be the same correct?

Yes, by definition. It is also known as "cosmological time" or I like "comoving time":

http://en.wikipedia.org/wiki/Comoving_distance#Comoving_coordinates