Universe Wiki - What is the universe?

The Universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy. While the spatial size of the entire Universe is still unknown, it is possible to measure the observable universe. The earliest scientific models of the Universe were developed by ancient Greek and Indian philosophers and were geocentric, placing Earth at the centre of the Universe. Over the centuries, more precise astronomical observations led Nicolaus Copernicus to develop the heliocentric model with the Sun at the centre of the Solar System. In developing the law of universal gravitation, Sir Isaac Newton built upon Copernicus' work as well as observations by Tycho Brahe and Johannes Kepler's laws of planetary motion. Further observational improvements led to the realization that our Sun is one of hundreds of billions of stars in a galaxy we call the Milky Way, which is one of at least hundreds of billions of galaxies in the Universe. Many of the stars in our galaxy have planets. At the largest scale galaxies are distributed uniformly and the same in all directions, meaning that the Universe has neither an edge nor a center. At smaller scales, galaxies are distributed in clusters and superclusters which form immense filaments and voids in space, creating a vast foam-like structure. Discoveries in the early 20th century have suggested that the Universe had a beginning and that space has been expanding since then, and is currently still expanding at an increasing rate.The Big Bang theory is the prevailing cosmological description of the development of the Universe. Under this theory, space and time emerged together 13.799±0.021 billion years ago with a fixed amount of energy and matter that has become less dense as the Universe has expanded. After an initial accelerated expansion at around 10−32 seconds, and the separation of the four known fundamental forces, the Universe gradually cooled and continued to expand, allowing the first subatomic particles and simple atoms to form. Dark matter gradually gathered forming a foam-like structure of filaments and voids under the influence of gravity. Giant clouds of hydrogen and helium were gradually drawn to the places where dark matter was most dense, forming the first galaxies, stars, and everything else seen today. It is possible to see objects that are now further away than 13.799 billion light-years because space itself has expanded, and it is still expanding today. This means that objects which are now up to 46 billion light years away can still be seen in their distant past, because in the past when their light was emitted, they were much closer to the Earth. From studying the movement of galaxies, it has been discovered that the universe contains much more matter than is accounted for by visible objects; stars, galaxies, nebulas and interstellar gas. This unseen matter is known as dark matter (dark means that there is a wide range of strong indirect evidence that it exists, but we have not yet detected it directly). The Lambda-CDM model is the most widely accepted model of our universe. It suggests that about 69.2%±1.2% [2015] of the mass and energy in the universe is a scalar field known as dark energy which is responsible for the current expansion of space, and about 25.8% [2015] is dark matter. Ordinary ("baryonic") matter is therefore only 4.9% [2015] of the physical universe. Stars, planets, and visible gas clouds only form about 6% of ordinary matter, or about 0.3% of the entire universe.There are many competing hypotheses about the ultimate fate of the universe and about what, if anything, preceded the Big Bang, while other physicists and philosophers refuse to speculate, doubting that information about prior states will ever be accessible. Some physicists have suggested various multiverse hypotheses, in which the Universe might be one among many universes that likewise exist..

What does the word universe mean? Find synonyms, antonyms and the meaning of the word universe in our free online dictionary! Find words starting with universe and anagrams of universe.

Definitions of "universe"

  • All matter and energy, including the earth, the galaxies, and the contents of intergalactic space, regarded as a whole. noun
  • The earth together with all its inhabitants and created things. noun
  • The human race. noun
  • The sphere or realm in which something exists or takes place. noun
  • Logic See universe of discourse. noun
  • Statistics See population. noun
  • The sum of everything that exists in the cosmos, including time and space itself; same as the Universe. noun
  • An entity similar to our Universe; one component of a larger entity known as the multiverse. noun
  • Everything under consideration. noun
  • An imaginary collection of worlds. noun
  • Intense form of world in the sense of perspective or social setting. noun
  • All created things viewed as constituting one system or whole; the whole body of things, or of phenomena; the to~ pa^n of the Greeks, the mundus of the Latins; the world; creation. noun
  • The totality of existing things; all that is in dynamical connection with general experience taken collectively—embracing the Creator and creation; or psychical and material objects, but excluding the Creator; or material objects only. noun
  • The whole world; all mankind; all that meets us in experience, in a loose sense. noun
  • In logic, the collection of all the objects to which any discourse refers: as, the universe of things. noun
  • everything that exists anywhere noun
  • (statistics) the entire aggregation of items from which samples can be drawn noun
  • everything stated or assumed in a given discussion noun

The word "universe" in example sentences

Thus if the spherical-surface beings are living on a planet of which the solar system occupies only a negligibly small part of the spherical universe, they have no means of determining whether they are living in a finite or in an infinite universe, because the “piece of universe” to which they have access is in both cases practically plane, or Euclidean.. [Chapter 31. The Possibility of a “Finite” and Yet “Unbounded” Universe]

Specifically the notion that what we call our universe is a 4-dimensional space-time that itself is just a surface in a higher dimensional space, called a brane, a 4-brane in this case.. [Astronomers Find Black Holes Do Not Absorb Dark Matter | Universe Today]

"The term universe in its complete physical sense applies to all matter in existence.". [Wild Dreams of Reality, 5]

The word universe literally means everything that exists.. [George’s Cosmic Treasure Hunt]

Since the universe is virtually transparent to radiation of these wavelengths, nothing would really have happened to it: the radiation would expand in universe at the same rate as the universe is expanding.. [Press Release: The 1978 Nobel Prize in Physics]

When we began to realize that there were other such vast aggregations of stars, we called them "island universes," but this was an obvious misnomer; since the word universe means everything there is, it can hardly have a plural.. [Yahoo! News: Business - Opinion]

Now Hoyle may have been wrong about the steady state theory – the very term "big bang" as used to describe the beginning of the universe is his own dismissive phrase for what he regarded as a poor alternative theory – but he was no fool otherwise, and it was only his own argumentative and bloody-minded character, it is said, that prevented him from winning the Nobel prize.. [The Black Cloud by Fred Hoyle – review]

Even if our universe is a random accident, we still want to believe that it must have been caused by the deterministic laws that govern it.. [Santhosh Mathew, PhD: Can We Predict the Future of the Stars?]

Still, it's not like the universe is always asking Superman to be a villain.. [Annotations for Trinity issue #46 | Robot 6 @ Comic Book Resources – Covering Comic Book News and Entertainment]

The nature of the universe is a point of interest to many of us and I note on this thread that Pixie and others have expressed surprise at the notion of an infinite universe.. [A Short Critique of Bradley Monton's Paper]

Meanwhile, I will continue to imagine geometries where square circles exist and accept the possibility that our universe is a grand science fair project created by a supernatural being (and delight at the thought).. [Amazing Thread v.2.0]

Religious belief, our sense of our selves as humans, our place in the universe is about to be seriously challenged, as it has been in the past.. [Sena Jeter Naslund: Beginning Again With Adam & Eve]

We are taught by great actions that the universe is the property of every individual in it.. [Tom Morris: Our Thoughts Are Too Small]

OK, I should probably explain that the centre of the universe is a blog.. [The centre of the universe likes Marseguro & Terra Insegura!]

In other words, the universe is always rearranging and readjusting.. [April Rudin: Change: A Powerful Force for Personal Growth]

Because making the Doctor the last line of authority in the universe is a bad idea ... it goes nowhere.. [More Doctor Who Speculation...]

Universe Translates

TurkishUniverse English to Turkish Translate
i. evren, kâinat, âlem, cihan.i. evren, kâinat, âlem, cihan.

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5 Theories About The Universe That Will Blow Your Mind
5 Theories About The Universe That Will Blow Your Mind
Journey Through The Universe - HD Documentary
Journey Through The Universe - HD Documentary
Living Universe. Documentary about space. HD movie 2018
Living Universe. Documentary about space. HD movie 2018

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News about universe


Universe Word Data

  • Pronunciations(yo͞oˈnə-vûrsˌ)
  • Character8
  • Hyphenation u ni verse


No universe equivalents found!
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Do not be too timid and squeamish about your reactions. All life is an experiment. The more experiments you make the better. (Ralph Emerson)
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