The galaxies are clear to ALMA’s radio vision, but disappear in Hubble’s visible light coverage. (Credit: Image (c) 2019 Wang et al.)
The universe is 13.8 billion years old, but scientists have trouble seeing back to its earliest days. This cosmic dawn has been obscured by time, distance, and the rest of the universe. Part of the problem is that light gets stretched as it travels across the cosmos. The longer the journey, the more stretched out its wavelengths become.
So our earthly tele