The universe is 95 percent invisible to our current senses
In short: Every atom, star, and human being is merely a tiny fraction of reality. While we see the light of the cosmos, the vast majority of the universe is composed of two mysterious, invisible components that dictate how everything—from galaxies to the expansion of space itself—actually behaves.
The cosmos is divided into three distinct categories. Less than five percent of the cosmos's total contents consists of observable light and atoms. The remaining 95 percent is dominated by two distinct phenomena: dark matter and dark energy. While they share the 'dark' moniker because they do not emit or reflect light, they play opposing roles in the cosmic architecture. These invisible components are the primary drivers of cosmic evolution. They represent the most significant hurdles for contemporary astronomers trying to grasp the universe's mechanics.
Dark matter acts as the universe's invisible scaffolding. This substance constitutes the bulk of galaxy cluster mass, exerting the gravitational force required to arrange matter across vast scales. Without it, galaxies would not have the structure we observe today. Conversely, the universe's accelerating expansion is propelled by the enigmatic force known as dark energy. Rather than pulling things together, it pushes the very fabric of space outward at an increasing rate. This invisible mass is essential for the organization of galaxies on grand scales. It provides the necessary gravitational glue for the cosmos.
Understanding these forces is a primary challenge for modern astronomy. Researchers use high-performance N-body simulations, such as the world’s largest suite, AbacusSummit, to predict large-scale structures and test various cosmological models. Current efforts, including the five-year Dark Energy Spectroscopic Instrument (DESI) survey, aim to map one-third of the sky over 11 billion years of cosmic history to finally decode the physics of these dominant, hidden forces. Scientists utilize quantum field theory and general relativity to propose models for the primordial universe. They also rely on data from the Chandra X-ray Observatory to study hot plasma inside galaxy clusters.
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Sources
- Summary by Intellect · source: Dark Matter vs Dark Energy: The Difference Explained: Lord Rees of Ludlow
- Also: Dark Energy and Dark Matter | Center for Astrophysics | Harvard & Smithsonian
- Also: www.gresham.ac.uk — Dark Matter vs Dark Energy: The Difference Explained
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