Take the 2-minute tour ×
Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It's 100% free, no registration required.

I have been reading a lot about Cosmological experiments such as Planck or WMAP that aim to investigate the CMB's power spectrum. I am unclear though as to what theses sky surveys actually measure, is it the distance to regions of temperature fluctuations?

share|improve this question

1 Answer 1

They measure the spectrum of microwaves (with pretty good angular resolution) over the whole sky.

The spectrum represents the red-shifted black-body of the hot, early universe plus local contributions. They separate out the underlying black-body spectrum and that is the signal.

Much information can be extracted from the temperature- and angular-fluxuations of the signal.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.