The concept of time is a subject of ongoing scientific investigation and philosophical debate. While certain theories, such as the theory of relativity, suggest that time is relative and can be influenced by factors such as velocity and gravity, the nature of time itself is still a topic of exploration.
According to the theory of relativity, time dilation and the relativity of simultaneity demonstrate that the passage of time can be experienced differently for observers in different reference frames. For example, an object moving at high speeds relative to an observer on Earth would experience time passing slower from the observer's perspective. This phenomenon has been experimentally verified through various experiments and observations, such as the famous Hafele-Keating experiment.
However, it is important to note that these effects primarily deal with the relative experience of time rather than providing conclusive evidence about the existence of past or future events. While the theory of relativity suggests that events in the past and future may exist in some sense, it doesn't necessarily imply that they exist in the same concrete way as the present.
In the realm of physics, there are also other interpretations of time, such as the block universe theory, which posits that the past, present, and future all exist simultaneously as an unchanging four-dimensional "block" of spacetime. However, this interpretation remains a subject of debate among physicists and philosophers, and it is not yet widely accepted as a proven fact.
Ultimately, our understanding of time is a complex and evolving field of study. While scientific theories provide insights into how time behaves, the philosophical and metaphysical questions surrounding the nature of time and its existence beyond our present experience remain open to interpretation and ongoing investigation.