Actually, light can carries enough energy to burn objects in its path, regardless of the distance it travels. However, the amount of energy it carries is determined by its wavelength/frequency, not di...
If E=mc2 is true, then the amount of energy needed for something to travel at the speed of light is infinite! Now imagine the energy needed to sustain that speed for 650M lightyears. For you to say, the amount energy needed to create that light is large but not large enough to burn every other galaxy in it vicinity is just not plausible. Either the galaxy is not 650M lightyears away or E=mc2 is wrong or both could be wrong ๐คท๐ปโโ๏ธ๐