From what I can understand, Cosmic Microwave Background Radiation (CMBR) is microwave now, but was initially visible light emitted long time ago.
The microwave is producing a wave that’s about 12 centimeters long.
Now CMBR has right now this (time changing) distribution (peak at 2mm):
So it looks to me that in some time, when its wavelength falls at around 12cm), some of its energy should be transferred to water molecules the way it is in a microwave oven.
- Is it the case? Will some of the CMBR energy actually transferred to water molecules?
- Will this energy be too faint to matter at our scale?