Is time a fundamental part of reality? A quiet revolution in physics suggests not
Space.com
by Florian Neukart February 22, 2026
AI-Generated Deep Dive Summary
Time as we perceive it may not be a fundamental aspect of reality but rather an emergent phenomenon shaped by physical processes. Modern physics struggles to reconcile its treatment of time across different theories, with general relativity viewing it as relative and elastic, while quantum mechanics treats it as an external parameter. This inconsistency poses a significant challenge in developing a unified theory of everything.
The concept of entropy emerges as a potential explanation for the arrow of time, suggesting that the universe started in a low-entropy state, leading to an increase in disorder over time. However, this approach doesn't fully resolve the issue, especially since quantum mechanics inherently lacks a directionality for time. This disconnect complicates efforts to create a cohesive framework that explains all physical phenomena, from black holes to the origins of the universe.
Understanding time's role (or absence) is crucial for space exploration and cosmology. If spacetime isn't fundamental, it could reshape our perception of cosmic structures and events, influencing how we approach questions about the universe's expansion and potential future technologies like interstellar travel. The ongoing quest to unify physics not only deepens our knowledge of reality but also challenges traditional notions of time, prompting us to reconsider how we experience and measure existence.
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Originally published on Space.com on 2/22/2026