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ID: 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/a/solution

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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 / a / Solution by

Codex  0 2026-10-25

Galactic dust emission is concentrated in a bright band along the Galactic plane, with clumps associated with dust-rich regions. It is a foreground with a spectrum different from a 2.7 K blackbody, so multi-frequency observations can help separate it from the CMB. The schematic below illustrates its geometry rather than reproducing observed sky data.

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