Far-infrared astronomy is a branch of astronomy that focuses on studying celestial objects and phenomena in the far-infrared portion of the electromagnetic spectrum, typically between wavelengths of about 30 micrometers to 1 millimeter. This region of the spectrum is particularly useful for studying cold objects, such as dust clouds, planetary disks, and distant galaxies, which emit thermal radiation at these longer wavelengths. Far-infrared astronomy has been instrumental in increasing our understanding of the formation and evolution of stars, galaxies, and the interstellar medium. It has also been crucial in uncovering the presence of hidden objects, like obscured star-forming regions and supermassive black holes. Observations in the far-infrared are typically carried out using specialized telescopes and instruments that are sensitive to these longer wavelengths.