toobfreak
Tungsten/Glass Member
- Apr 29, 2017
- 99,055
- 105,072
- 3,615
Sorry to bust Professor Indies bubble here, but microwave radiation only travel's at 1C in free space in a vacuum. They are just radio waves. It isn't red-shifted down from a higher state if it was generated as a microwave! And microwaves do not travel forever (maybe in theory but rarely in practicality as they are direct straight line only), the power density of EM waves is proportional to the inverse of the square of the distance they travel, so for every doubling of their distance, their power is quartered. MWR is highly reactionary to the medium they travel in, so unless in absolute unfettered free space, often get blocked or absorbed as heat which is why they are so good at cooking food because water molecules resonate well at their frequency!
From what you stated, microwaves are only good for cooking in a confined space isn't it? Out in space or spacetime, they aren't confined and do get blocked out. What do you think is causing it, seemingly everywhere space is? I guess it is a form of radiation or heat, but we do not see it like we normally see heat as an orange red color.
It's a matter of efficiency. Your microwave oven confines and reflects the energy to limit the amount of power needed put into it to get sufficient power to heat and cook the food in a reasonable time by shaking the water molecules. Standing waves develop at the nodes of the compartment causing hot and cold spots which is why they rotate the food.
Out in space left untouched in a straight line, they merely fade in strength from a given source over distance like any wavefront. Since the CMB is basically coming from all directions, it is pretty even. There is no "direction" you can look in to say the big bang happened over "there" because "there" was originally a point source or "everywhere," then space expanded giving us here, there and everywhere.
A lot of people mistakenly believe the CMB is a signal from the creation of the universe, but it actually is the radiational background "stretched-out" from the expansion of space just as the sound of a train goes lower as it passes. What remains today is down in the low end of the microwave region almost into the UHF band (radio). You could actually kind of detect some of it in the old days if you tuned between TV channels and looked at the static noise pattern on the tube. Some of that was the CMB of the universe.
After the universe began, once it cooled enough, it eventually cooled to where protons and electrons could form and matter and energy were able to separate from each other. It was at that point that a "spherical surface of last scattering" occurred which is the farthest back in time we can see, about 13.8 billion light years back. That's not to say the universe isn't older, just that this is the farthest back we can see where ordinary matter began and energy decoupled from it to form what we hear today as a cool hiss just above absolute zero. Hopefully that makes a little sense and answers your questions.
Last edited: