Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Is the Universe really infinite/absolute 0

  1. Dec 1, 2012 #1
    Ok, so I was just thinking about this today. First off, I was thinking about absolute zero, and how they say it's impossible, but then I thought about what the average temp. of the universe is. According to several internet sources, the current average temp is about 2.73 kelvin. I was wondering, how is that possible if the universe is infinite if the average temperature is above 0 (because you would end up getting all the temperatures over the area, which is infinite, so you would end with an average temp of 0)?
  2. jcsd
  3. Dec 1, 2012 #2


    User Avatar
    Science Advisor

    There is no evidence that the universe is infinite. The observable universe, which is the part that we can see and interact with, is clearly finite.
  4. Dec 1, 2012 #3


    User Avatar
    Gold Member

    There is zero evidence either way as to whether or not the universe is infinite or finite, but what difference does it make? Given homogeneity, why would you expect the average for one big volume (say the size of the observable universe) to be different than another big volume?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook