If the universe were truly infinite, the concept of dimensions and their structure becomes more complex to comprehend. However, I can provide some insights based on current scientific understanding and theories:
Three Spatial Dimensions: Our everyday experience is in three spatial dimensions—length, width, and height. These dimensions define the space we perceive and interact with. In an infinite universe, these spatial dimensions would continue indefinitely without boundaries.
Time: Time is often considered the fourth dimension. It allows events to be ordered and provides a framework for causality. In an infinite universe, time would continue indefinitely in both directions, past and future.
Hypothetical Extra Dimensions: Some scientific theories, such as string theory, propose the existence of additional spatial dimensions beyond the three we experience. These extra dimensions, if they exist, would be compactified or "curled up" at incredibly small scales, making them unobservable on our macroscopic scale. In an infinite universe, these extra dimensions could also extend infinitely.
However, it's important to note that the concept of an infinite universe is still a subject of speculation and debate in cosmology. Observational evidence and theoretical models do not conclusively confirm whether the universe is infinite or finite.
If the universe is finite, it could still be unbounded, meaning it lacks an edge or boundary. In such a case, the shape of the universe would depend on its curvature, which is determined by factors like the distribution of matter and energy. Possible shapes include flat, positively curved (spherical), or negatively curved (hyperbolic).
Ultimately, the true nature of the dimensions and structure of the universe, especially if it is infinite, is a topic of ongoing scientific exploration and investigation.