Essay on Dark matter and dark energy

The Hidden Pillars of the Universe

When we look up at the night sky, we see a vast expanse of stars, planets, and glowing nebulae. However, these visible objects make up only a tiny fraction of the cosmos. Scientists have discovered that roughly 95 percent of the universe is composed of substances we cannot see or touch. This mysterious cosmic environment is shaped by two invisible forces: dark matter and dark energy. While they share a name, they serve very different roles in the history and structure of the universe. Understanding these phenomena is essential because they dictate how the universe began, how it grows, and how it might eventually end.

The Invisible Glue of Galaxies

Dark matter acts as the invisible glue that holds galaxies together. Scientists first suspected its existence when they noticed that galaxies were spinning much faster than they should be based on the visible matter they contained. Without some extra, unseen weight providing additional gravity, these galaxies would fly apart like spinning droplets of water. Unlike normal matter, this substance does not emit, absorb, or reflect light, making it impossible to see with traditional telescopes. However, its gravitational pull is undeniable. It acts as a structural framework, or a cosmic scaffolding, that allows stars and gas to gather into the massive, organized systems we observe today. Without the presence of dark matter, the universe would likely be a disorganized cloud of gas rather than a collection of distinct galaxies.