Astronomy has a blind spot in the area of far-infrared radiation compared to most other wavelengths. A far-infrared space telescope can only utilize its full sensitivity with an actively cooled mirror at temperatures below 4 Kelvin (-269 ℃). Such a telescope doesn’t exist yet, which is why there has been little worldwide investment in the development of corresponding detectors.
Click here for original story, Far-infrared detector KID reaches highest possible sensitivity
Source: Phys.org