red-shift and cosmic microwave background radiation are two phenomena observed by astronomers describe each phenomenon and explain how it relates to the big bang model

Question

gebooors · Answer

Stars which contain mainly
Hydrogen and little Helium, emit certain wavelengths.

When stars are moving away with great speed, these wavelengths
Are red-shifted, also wavelengths grow. It is like Doppler effect,
But flow electromagnetic radiation.

anonymous · Answer

what about cosmic microwave background radiation @Gebooors

gebooors · Answer

So called 3 K radiation means that temperature of space is same in
Every direction. So, space has inflated such a long time that it's 
Temperature has dropped near absolute zero.