Using archival data from the Giant Metrewave Radio Telescope, astronomers have captured a radio signal at a specific wavelength known as the 21 cm line from SDSS J0826+5630, a star-forming galaxy that existed nearly 9 billion years ago. This is the first time this type of radio signal has been detected at such a large distance. The radio image of SDSS J0826+5630. Image credit: Chakraborty & Roy, doi: 10.1093/mnras/stac3696. “A galaxy emits...
