The concept of something existing forever is a topic of philosophical and scientific debate. In the context of the universe and physical entities, our current understanding suggests that nothing lasts forever.
In the realm of physics, the second law of thermodynamics states that the entropy of an isolated system tends to increase over time. Entropy is a measure of disorder or randomness within a system. This law implies that the universe as a whole is moving towards a state of increasing disorder, known as the heat death or the maximum entropy state. In such a state, it is believed that the universe will no longer be able to sustain any significant processes, and all energy will be evenly distributed and unavailable for further use.
Similarly, on a smaller scale, objects and entities in the universe are subject to various processes of decay and change. Stars burn out, planets erode, living organisms age and eventually die. This suggests that everything we observe in the physical world has a limited lifespan.
From a philosophical perspective, the concept of eternity or something existing forever can be approached differently. Some philosophical and religious traditions posit the existence of eternal or timeless entities such as souls, spiritual realms, or abstract concepts like mathematical truths. These concepts go beyond the scope of scientific inquiry and rely on different frameworks of understanding.
Ultimately, whether something can exist forever depends on the context in which you are considering it. In the physical world governed by known scientific laws, nothing seems to last forever. However, in the realm of abstract ideas or metaphysical concepts, the notion of eternal existence may be contemplated and interpreted differently.