Blake Temple, a mathematician at the University of California Davis, has raised significant questions about dark energy, a concept that has underpinned modern cosmology for nearly three decades. In a study published in the *Proceedings of the Royal Society*, Temple's team demonstrated that the standard model of cosmic expansion, which relies on dark energy to explain the universe's accelerating expansion, is fundamentally unstable. They argue that the Friedmann spacetimes, which form the mathematical basis for this model, are mathematically untenable. Importantly, their findings suggest that the universe's acceleration can be explained through Einstein's original equations without the need for dark energy. This revelation challenges the long-held belief that dark energy is essential to our understanding of cosmic dynamics. Moreover, both the traditional and new models imply that Earth occupies a unique position in the universe, contradicting the Copernican principle, which posits that our planet is not special. The implications of this research could reshape our understanding of the universe's structure and the forces at play.