The universe, in its vastness and complexity, has captivated human imagination for millennia. From the earliest civilizations tracking the movement of celestial bodies to modern astronomers using cutting-edge telescopes, humanity has sought to understand the cosmos. One of the most profound discoveries of modern cosmology is that the universe is not static—it is expanding. Even more intriguing is the realization that this expansion is accelerating, driven by a mysterious and pervasive phenomenon known as dark energy. Despite making up approximately 68% of the total energy content of the universe, dark energy remains one of the greatest enigmas in physics. Understanding dark energy and the expanding universe is essential not only for cosmology but also for fundamental physics, as it challenges our understanding of gravity, spacetime, and the fate of the cosmos.

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