= Solution
After subtracting the mean, the motion-induced dipole and <galactic foregrounds>, intrinsic <Cosmic microwave background anisotropy> appears as angular hot and cold patches, typically at the $10^{-5}$ fractional scale. These spatial <temperature fluctuations> encode early density and velocity structure. The displayed patch pattern is illustrative, with no claim to reproduce an observed sky map.
\Image[/past-exam-of-the-short-options-paper-shared-by-prelims-and-parts-a-and-b-of-the-physics-course-of-the-university-of-oxford/2012-s2-microwave-sky-components.png]
{title=Schematic microwave components: Galactic dust, a kinematic dipole and intrinsic anisotropy, using separate colour scales}
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