Why must detectors be cooled to ~100 millikelvin?

Simons Observatory Special.With Manchester playing a key role within the Simon Observatory’s development, we’ve recorded a special episode during their face-to-face meeting here. We talk to SO:UK Principal Investigator Prof Michael Brown about what makes this project so exciting and a Jodbite with Dr Katie Harrington, on her work testing and integrating the instrumentation into large telescope construction. Finally, we spoke with a range of SO collaborators over lunch at the meeting and take a whistlestop tour on what it really takes and who is involved when you build a telescope.