What's the average temperature of the universe, including all stars and space?

Answer 1

The commonly accepted figure is about 2.73 degree's Kelvin...However, i believe that this figure can never be truely obtained because of what possible temperatures exist near the boundries of the expanding universe.

Answer 2

Space is vast, the temperature of the stars and planets hardly matter.

"Now back when the universe was born (and the Big Bang and all that) everything was very hot. But as the universe expanded, this energy got diluted over a much larger volume, and so the universe cooled down. The average background temperature of the Universe today is 2.73Cº (or 2.73 Kelvin) above Absolute Zero."
Quoted from: http://www.abc.net.au/science/k2/moments/s947134.htm

Answer 3

Temperature, being the average energy in the system, is impossible to estimate because we do not know the limits of initial conditions of the system. However, some things we do know is that the energy is that same as when the alleged Big Bang occured, and the kinetic energy is approaching the bottom of the parabola.

Answer 4

Just a guess, but probably close to absolute zero. Since much of space is absolutely empty.

Answer 5

2.73K

the result is given by WMAP satellite(situated at legrange point 2)
and COBE satellite

famous scientist Alen Gooth has given inflation theory for explanation for this result

Answer 6

2.73 kelvin