Homework Help: 3K universal blackbody temperature radiation

1. Nov 22, 2007

neelakash

1. The problem statement, all variables and given/known data

What does the 3K universal blackbody temperature radiation tell us about the temperature of the outer space?

2. Relevant equations
3. The attempt at a solution

the 3K universal blackbody radiation is regarded as the remnant of the Big Bang.And this temperature looms all over the space.
I know this much(not sure if correct).

2. Nov 22, 2007

mgb_phys

It also tells you the lowest possible temperature for empty space.
Heat always flows from hot to cold - if you had any point in space less than 3K and it is surrounded on all sides by a background of 3K what would happen?

3. Nov 22, 2007

neelakash

so,there cannot be such a place with lower T.That would reduce the Temperature 3K

4. Nov 22, 2007

mgb_phys

Correct, nothing in space can come to equibrium at a temperature below 3K
Atlthough you can obviously have man(or alien!)-made devices at below 3K but only be using energy.