The concept of time in the context of relativity theory is indeed relative and depends on the observer or frame of reference. This perspective raises interesting questions about the nature of time and its existence on a universal scale.
In the theory of relativity, time is intricately linked with space, forming a unified entity called spacetime. Spacetime provides a framework in which events occur and can be measured relative to different observers or frames of reference. The measurements of time can differ between observers depending on their relative motion and gravitational fields.
From this viewpoint, one can argue that there isn't a single universal "time" that governs the entire universe independently of observers. Different observers may indeed experience or measure time differently based on their relative motion or gravitational environments. This concept challenges the notion of an absolute or objective time that exists independently of observers.
However, it's important to note that while time may be relative, it is still a fundamental aspect of our physical reality. Time is a crucial element in the description of various phenomena, such as the dynamics of objects, the propagation of light, and the evolution of the universe.
In practical terms, for most everyday situations and low relative velocities, the differences in measured time between observers are negligible. It is only in extreme cases, such as near the speed of light or in strong gravitational fields, that significant time dilation effects become noticeable.
So, while the relativity of time challenges our intuitive notion of a universal time, it does not imply that time does not exist at all. Time remains a meaningful and essential concept within the framework of relativity, allowing us to understand and describe the behavior of physical systems from different perspectives.