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- Dictionaryu·ni·verse/ˈyo͞onəvərs/
noun
- 1. all existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion light years in diameter and contains a vast number of galaxies; it has been expanding since its creation in the Big Bang about 13 billion years ago. Similar
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Jan 17, 2017 · The most popular theory of our universe's origin centers on a cosmic cataclysm unmatched in all of history—the big bang. Learn about the big bang theory and how our universe got...
May 21, 2013 · The cosmos began 13.7 billion years ago with the big bang. A fraction of a second after the beginning, the universe was a hot, formless soup of the most elementary particles, quarks and...
Oct 19, 2023 · How old is the universe, and how did it begin? Throughout history, countless myths and scientific theories have tried to explain the universe's origins. The most widely accepted explanation is the big bang theory.
Mar 1, 2018 · How old is the universe, and how did it begin? Throughout history, countless myths and scientific theories have tried to explain the universe's origins.
Jul 26, 2023 · This shows that the universe went through a transition from an ionized gas (a plasma) and a neutral gas. Such a transition implies a hot, dense early universe that cooled as it expanded.
The origin, evolution, and nature of the universe have fascinated and confounded humankind for centuries. New ideas and major discoveries made during the 20th century transformed cosmology – the term for the way we conceptualize and study the universe – although much remains unknown.
Some of the earliest cosmological models of the universe were developed by ancient Greek and Indian philosophers and were geocentric, placing Earth at the center. [12] [13] Over the centuries, more precise astronomical observations led Nicolaus Copernicus to develop the heliocentric model with the Sun at the center of the Solar System.
All matter in the universe was formed in one explosive event 13.7 billion years ago – the Big Bang. The Big Bang. In 1929 the American astronomer Edwin Hubble discovered that the distances to far-away galaxies were proportional to their redshifts.
The origin, evolution, and nature of the universe have fascinated and confounded humankind for centuries. New ideas and major discoveries made during the 20th century transformed cosmology – the term for the way we conceptualize and study the universe – although much remains unknown. Learn more.
About 13.8 billion years ago, the Big Bang gave rise to everything, everywhere, and everywhen—the entire known Universe. What caused the Big Bang? What happened that first moment at the beginning of the Big Bang?
