This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
WMAP ILC b. en WMAP Internal Linear Combination Map Comment The Internal Linear Combination Map is weighted linear combination of the five WMAP frequency maps The weights are computed using criteria which minimize the Galactic foreground contribution to the sky signal The resultant map provides lowcontamination image of the CMB