The universe is vast beyond comprehension, stretching far beyond the limits of our understanding. It encompasses everything we know, from the smallest particles to the largest galaxies. Our solar system is just a tiny speck in the grand expanse of space, and Earth itself is but a small dot in the grand scheme of things. This unimaginable scale raises profound questions: How did the universe come to be? What forces shape its destiny? And what is the true nature of the cosmos that surrounds us?

The history of cosmology dates back thousands of years. Ancient civilizations looked up at the night sky and began to ponder the movements of the stars. Early astronomers devised rudimentary models of the universe, many of which placed Earth at its center. These early models, though flawed, laid the foundation for future discoveries. The development of telescopes in the 17th century, most notably by Galileo, brought a revolution in how we view the universe. With the advent of modern science, these early theories were replaced by more accurate models, culminating in our current understanding of the cosmos.

One of the most significant breakthroughs in the history of cosmology was the discovery that the universe is expanding. In the early 20th century, astronomer Edwin Hubble observed that galaxies were moving away from us, leading to the realization that the universe itself was stretching outward. This discovery, known as Hubble's Law, provided key evidence for the Big Bang theory, which suggests that the universe began as a singularity and has been expanding ever since. The Big Bang theory remains the most widely accepted explanation for the origin of the universe.