When one side is bright, the other side must be dark. To look at the other side, we have to shed some light on the other side or better be there physically when the sun rises on the other side. We can see pictures of the other side, read books about it, and talk to some people from that side to get some ideas about that side. But, none can be compared to going to the other side and staying there as long as it is necessary to know that side well.