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Concepts Encyclopedia Entry 1782972065

This encyclopedia entry explores the fundamental concepts of **Dark Matter** and **Dark Energy**, two mysterious components that make up approximately 95% of the universe's mass-energy budget. ## Overview The universe is a vast and complex expanse, comprising a multitude of celestial objects, from stars and galaxies to black holes and cosmic structures. However, despite our extensive understanding of the universe's composition, there exist two enigmatic entities that have long puzzled scientists: **Dark Matter** and **Dark Energy**. These invisible components are thought to be responsible for the observed behavior of galaxies, galaxy clusters, and the universe's accelerating expansion. In this entry, we will delve into the history, key information, and significance of these mysterious concepts. ## History/Background The concept of **Dark Matter** dates back to the early 20th century, when Swiss astrophysicist **Fritz Zwicky** first proposed its existence. While studying galaxy clusters, Zwicky noticed that the galaxies within these clusters were moving at much higher velocities than expected, suggesting that there was a large amount of unseen mass holding them together. This idea was further developed by **Jan Oort** in the 1930s, who proposed that **Dark Matter** consisted of unseen, non-luminous particles that interacted with normal matter through gravity. In the 1990s, the discovery of **Dark Energy** revolutionized our understanding of the universe's evolution. **Saul Perlmutter**, **Adam Riess**, and **Brian Schmidt** led a team of scientists that observed the light from distant supernovae, which revealed that the expansion of the universe was accelerating. This observation led to the conclusion that **Dark Energy**, a mysterious, negative-pressure component, was driving the acceleration. ## Key Information * **Dark Matter**: + Comprises approximately 27% of the universe's mass-energy budget + Interacts with normal matter through gravity, but not through electromagnetic forces + Thought to be composed of Weakly Interacting Massive Particles (WIMPs) + Plays a crucial role in the formation and evolution of galaxies * **Dark Energy**: + Comprises approximately 68% of the universe's mass-energy budget + A negative-pressure component that drives the acceleration of the universe's expansion + Thought to be a property of space itself, rather than a particle or field + Plays a crucial role in the universe's large-scale structure and evolution ## Significance The discovery of **Dark Matter** and **Dark Energy** has far-reaching implications for our understanding of the universe. These components are responsible for the observed behavior of galaxies, galaxy clusters, and the universe's accelerating expansion. The study of **Dark Matter** and **Dark Energy** has led to significant advances in our understanding of the universe's evolution, from the Big Bang to the present day. INFOBOX: - Name: Dark Matter and Dark Energy - Type: Cosmological components - Date: 20th century (Dark Matter), 1990s (Dark Energy) - Location: Universe-wide - Known For: Responsible for the observed behavior of galaxies and the universe's accelerating expansion TAGS: **Dark Matter**, **Dark Energy**, **Cosmology**, **Galaxies**, **Galaxy Clusters**, **Supernovae**, **WIMPs**, **Negative Pressure**, **Accelerating Expansion**