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Results tagged with cosmic-microwave-background
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user 84727
The cosmic microwave background (CMB) is the electromagnetic radiation in the microwave band which can be observed throughout the whole universe, not connected to any astronomical object. Its spectrum follows a very precise black-body radiation with a temperature of about 2.7 K.
12
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3
answers
1k
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If I live on a planet that is heavy enough, would the CMB get blue shifted to be in the visi...
If I live on a planet that is heavy enough, would the CMB get blue shifted enough in the atmosphere of this heavy planet, due to gravitational blue-shifting, that the CMB would be in the visible spect …
- 365
5
votes
3
answers
612
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If a CMB photon traveled for 13.7 billion years to reach me, how far away was the source of ...
If a CMB photon traveled for 13.7 billion years (- 374,000 years) to reach me.
How far away was the source of that CMB photon when it first emitted it?
My attempt to solve this question was to use the …
- 365