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🪐 The cosmic microwave background glows faintly across the entire sky at a temperature just above absolute zero—about 2.7 Kelvin—making it the coldest light we can detect. Instruments like the South Pole Telescope have measured tiny variations in this ancient glow from different directions, and these differences help scientists determine the universe’s overall geometry, showing that space is almost perfectly flat on the largest scales we can observe. ✨ #microwavespace⚡#universe⚡#geometry⚡#nasa⚡#galaxy⚡#stars⚡#astronomy⚡#cosmos⚡#space 👉subscribe Universe Mysteries 👉more Channels ​