Currently the best temperature is determined to be 2.7255 +/- 0.0006 Kelvin (Fixsen et al. 2009, ApJ, 707, 916).

- Looks suspiciously like
*e*Kelvin (=2.718281828 K). - Is it the triple point of water divided by 100 (=2.7315 K)?
- Could it be precisely 30/11 Kelvin (=2.727 K)?
- What about -ln(9 α) Kelvin (=2.723 K)?
- Or perhaps √(15/2) Kelvin (=2.739 K)?
- How about (2 α/π)
^{4}*m*_{e}*c*^{2}/*k*(=2.762 K)? - Or maybe (2/5) (α
_{G}*m*_{e}/ 2π*m*_{p})^{1/4}*m*_{p}*c*^{2}/*k*(=2.719 K)? - Or even (4/π) α
^{-3}α_{G}^{1/2}*m*_{p}*c*^{2}/*k*(=2.741 K)? - Or even better 16 √2π
α
_{G}^{1/4}*m*_{e}*c*^{2}/*k*(=2.727 K)? - Or closer still (45/2π
^{4})^{1/4}α_{G}^{1/4}α^{-3/4}(*m*_{e}/*m*_{p})^{3/8}*m*_{e}*c*^{2}/*k*(=2.7254 K)? - Or in terms of Planck units, what about
e
^{-73}*T*_{Pl}(=2.805 K), where*T*_{Pl}=√(*ħ**c*^{5}/*G*)/*k*?- [and
*e*^{-73}is close to*e*^{-πeπ}]

- [and
- Or turning to imperial units such as the League (=3 miles), how about
*hc/k*(µL)^{-1}(=2.98 K)?

Let me know if you have other stupid ideas!

Interested surfers with nothing better to do might like to think of reasons
why the CMB is at -270.425° Celsius or -454.765° Fahrenheit.

Last revised: April 2016