This is generally an interesting book. It is worth reading. I do not particularly like the ending of the story. I don't think that is a realistic way of how time flow / circulate back if it were to happen in reality. Since I am not a physicist or astronomy specialist , I am not sure if the story is scientifically sound on time-space concept (even though it is just sci-fi, not science) when stars begin to move towards the blue strides on spectrum. Thank you.