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3K universal blackbody temperature radiation

  1. Nov 22, 2007 #1
    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).

    Please check this.
     
  2. jcsd
  3. Nov 22, 2007 #2

    mgb_phys

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    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?
     
  4. Nov 22, 2007 #3
    so,there cannot be such a place with lower T.That would reduce the Temperature 3K
     
  5. Nov 22, 2007 #4

    mgb_phys

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    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.
     
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