While observing the Sun, which is 8 light-minutes 12 light-seconds away from us. We (by visible and invisible spectrum of the electromagnetic radiation) observe its state 8.20 minutes ago. Special relativity forbids any information to travel at speeds greater than that of light. This should apply to the information that a mass exists at a particular distance, which is mediated by gravitons. Thus, by all means, the information about Sun that we have is 8.2 minutes old. If we apply this to Deneb, a star 1.4k light-years away from Earth, its state at a time 1.4k years will we see. Then to the M87 galaxy - 55 ± 1 Mly - its state at a time 55 ± 1M years ago. How do we model the universe at present (for computations) when we have information that is older further the body away from us? More importantly, how can we compare two objects at different times?