If light was released ~.38MY after the big bang and the expansion of the universe has caused it to shift into the microwave region why is it referred to as being 2.7K? Temperature is the movement of excited molecules in a medium whereas radiation only has frequency and intensity. What does the "temperature" mean?
Asked
Active
Viewed 51 times
0
Qmechanic
- 201,751
-
1Possible duplicate of Temperature in space – John Rennie Apr 27 '18 at 06:41
-
1See also The temperature in space is about 3K, however there are almost no atoms in space. How can there be residual heat? – John Rennie Apr 27 '18 at 06:41
-
1Also How can interstellar space have a temperature of 2-3K? – John Rennie Apr 27 '18 at 06:42
-
@john rennie ok – user5389726598465 Apr 27 '18 at 06:43