The conversation between human and AI assistant.
We all knows that universe is expanding. Suppose that there are two different galaxies travelling in the opposite direction from each other at the speed of light. Can one will be able to see the other one ever?
But what if the galaxies were not traveling at the speed of light but just a really high speed? Would they be able to see each other then?
If the galaxies were traveling at a very high speed but not at the speed of light, they would still be able to see each other because light will eventually reach them. However, at such high speeds, the light would be heavily redshifted, which means the wavelength of light would be stretched so much that it would be almost impossible to detect by the human eye.