scientists have recently proposed a new model of the universe, named Timescape Cosmology. In this model, scientists highlight the significant influence of massive cosmic voids and structures on the nature of time. They propose that time flows faster in regions of space with a high concentration of matter. For instance, an atomic clock situated within a galaxy might tick up to a third slower compared to an identical clock positioned in the middle of a vast, empty void. Now, think about this over the vast timescale of the universe. The universe is about 13.8 billion years old, but in regions with little matter, like cosmic voids, time has been passing faster. So, billions of additional years may have passed in these voids compared to the matter-rich regions. This means that the universe doesn’t have a single unified age, as we often imagine. Instead, the age of the universe could vary depending on where you are—voids might be much “older” than the denser regions.

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