There is nothing special about the present moment, the Now, or indeed about any other moment. Past, present and future are all on an equal footing, because there is no slice through spacetime which can be uniquely identified as “the present”. The Universe does not change, but it exists, as a fixed block of spacetime that contains all the things that have ever happened, and all the things that ever will happen. The flow of time is an illusion. Philosophers call this idea (or something so similar to this idea that as a physicist I cannot spot the differences) “eternalism”.
