After foreground and dipole removal, primordial CMB anisotropies are small hot and cold patches across the sky, with characteristic correlated angular scales and <Amplitude>[amplitudes] of order $10^{-5}$ of the mean <temperature>. They trace perturbations at <photon decoupling> and subsequent propagation, not simply the current distribution of <Milky Way> dust.

Solution

Past exam of the short options paper shared by Prelims and Parts A and B of the physics course of the University of Oxford / 2016 / S2 / 3 / c / Solution

 Solution (source code)