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Universe


Universe Explanation ::-- Universe Facts || Universe History ||Universe geography || Bing Bang ||


The Universe is commonly defined as the totality of everything that exists, including all matter and energy, the planets, stars, galaxies, and the contents of intergalactic space. Definitions and usage vary and similar terms include the cosmos, the world and nature. Scientific observation of earlier stages in the development of the Universe, which can be seen at great distances, suggests that the Universe has been governed by the same physical laws and constants throughout most of its extent and history. There are various multiverse theories, in which physicists have suggested that our universe is one among many universes that likewise exist.

 

Many cultures have stories describing the origin of the world, which may be roughly grouped into common types. In one type of story, the world is born from a world egg; such stories include the Finnish epic poem Kalevala, the Chinese story of Pangu or the Indian Brahmanda Purana. In related stories, the creation idea is caused by a single entity emanating or producing something by him- or herself, as in the Tibetan Buddhism concept of Adi-Buddha, the ancient Greek story of Gaia (Mother Earth), the Aztec goddess Coatlicue myth, the ancient Egyptian god Atum story, or the Genesis creation narrative. In another type of story, the world is created from the union of male and female deities, as in the Maori story of Rangi and Papa. In other stories, the universe is created by crafting it from pre-existing materials, such as the corpse of a dead god — as from Tiamat in the Babylonian epic Enuma Elish or from the giant Ymir in Norse mythology – or from chaotic materials, as in Izanagi and Izanami in Japanese mythology. In other stories, the universe emanates from fundamental principles, such as Brahman and Prakrti, or the yin and yang of the Tao.



Creation myth

A creation myth or creation story is a symbolic account of how the world began and how people first came to inhabit it. They develop in oral traditions and are the most common form of myth, found throughout human culture. In the society in which it is told, a creation myth is usually regarded as conveying profound truths, metaphorically, symbolically and sometimes even in a historical or literal sense. They are commonly, although not always, considered cosmogonical myths—that is they describe the ordering of the cosmos from a state of chaos or amorphousness. They often are considered sacred accounts and can be found in nearly all known religious traditions.
Several features are found in all creation myths. They are all stories with a plot and characters who are either deities, human-like figures, or animals, who often speak and transform easily. They are often set in a dim and nonspecific past, what historian of religion Mircea Eliade termed in illo tempore (English: at that time). Also, all creation myths speak to deeply meaningful questions held by the society that shares them, revealing of their central worldview and the framework for the self-identity of the culture and individual in a universal context.

Types

Ex nihilo

Creation ex nihilo (Latin "out of nothing"), also known as "creation de novo", is a common type of mythical creation. Ex nihilo creation is found in creation stories from ancient Egypt, the Rig Veda, the Bible and the Quran, and many animistic cultures in Africa, Asia, Oceania and North America. The Debate between sheep and grain is an example of an even earlier form of ex nihilo creation myth from ancient Sumer. In most of these stories the world is brought into being by the speech, dream, breath, or pure thought of a creator but creation ex nihilo may also take place through a creator's bodily secretions. The literal translation of the phrase ex nihilo is "from nothing" but in many creation myths the line is blurred whether the creative act would be better classified as a creation ex nihilo or creation from chaos. With ex nihilo, the potential and the substance of creation springs from within the creator. Such a creator may or may not be existing in physical surroundings such as darkness or water, but does not create the world from them. In creation from chaos the substance used for creation is pre-existing within the unformed void.

Creation from chaos

In creation from chaos myth, initially there is nothing but a formless, shapeless expanse. In these stories the word "chaos" means "disorder", and this formless expanse, which is also sometimes called a void or an abyss, contains the material with which the created world will be made. Chaos may be described as having the consistency of vapor or water, dimensionless, and sometimes salty or muddy. These myths associate chaos with evil and oblivion, in contrast to "order" (cosmos) which is the good. The act of creation is the bringing of order from disorder, and in many of these cultures it is believed that at some point the forces preserving order and form will weaken and the world will once again be engulfed into the abyss.



World parent

There are two types of world parent myths, both describing a separation or splitting of a primeval entity, the world parent or parents. One form describes the primeval state as an eternal union of two parents, and the creation takes place when the two are pulled apart. The two parents are commonly identified as Sky (usually male) and Earth (usually female) who in the primeval state were so tightly bound to each other that no offspring could emerge. These myths often depict creation as the result of a sexual union, and serve as genealogical record of the deities born from it.
In the second form of world parent myth, creation itself springs from dismembered parts of the body of the primeval being. Often in these stories the limbs, hair, blood, bones or organs of the primeval being are somehow severed or sacrificed to transform into sky, earth, animal or plant life, and other worldly features. These myths tend to emphasize creative forces as animistic in nature rather than sexual, and depict the sacred as the elemental and integral component of the natural world.

Emergence

In emergence myths humanity emerges from another world into the one they currently inhabit. The previous world is often considered the womb of the earth mother, and the process of emergence is likened to the act of giving birth. The role of midwife is usually played by a female deity, like the spider woman of Native American mythology. Male characters rarely figure into these stories, and scholars often consider them in counterpoint to male oriented creation myths, like those of the ex nihilo variety.
Emergence myths commonly describe the creation of people and/or supernatural beings as a staged ascent or metamorphosis from nascent forms through a series of subterranean worlds to arrive at their current place and form. Often the passage from one world or stage to the next is impelled by inner forces, a process of germination or gestation from earlier, embryonic forms. The genre is most commonly found in Native American cultures where the myths frequently link the final emergence of people from a hole opening to the underworld to stories about their subsequent migrations and eventual settlement in their current homelands.

Earth-diver

The earth-diver is a common character in various traditional creation myths. In these stories a supreme being usually sends an animal into the primal waters to find bits of sand or mud with which to build habitable land. Some scholars interpret these myths psychologically while others interpret them cosmogonically. In both cases emphasis is placed on beginnings emanating from the depths. Earth-diver myths are common in Native American folklore but can be found among the Chukchi and Yukaghir, the Tatars and many Finno-Ugrian traditions. The pattern of distribution of these stories suggest they have a common origin in the eastern Asiatic coastal region, spreading as peoples migrated west into Siberia and east to the North American continent.
Characteristic of many Native American myths, earth-diver creation stories begin as beings and potential forms linger asleep or suspended in the primordial realm. The earth-diver is among the first of them to awaken and lay the necessary groundwork by building suitable lands where the coming creation will be able to live. In many cases, these stories will describe a series of failed attempts to make land before the solution is found.


universe

Size, age of Universe

The universe is immensely large and possibly infinite in volume. The region visible from Earth (the observable universe) is a sphere with a radius of about 46 billion light years, based on where the expansion of space has taken the most distant objects observed. For comparison, the diameter of a typical galaxy is only 30,000 light-years, and the typical distance between two neighboring galaxies is only 3 million light-years. As an example, our Milky Way Galaxy is roughly 100,000 light years in diameter,and our nearest sister galaxy, the Andromeda Galaxy, is located roughly 2.5 million light years away. There are probably more than 100 billion (1011) galaxies in the observable universe. Typical galaxies range from dwarfs with as few as ten million (107) stars up to giants with one trillion (1012) stars, all orbiting the galaxy's center of mass. A 2010 study by astronomers estimated that the observable universe contains 300 sextillion (3×1023) stars.

The age of the universe is the time elapsed since the Big Bang posited by the most widely accepted scientific model of cosmology. The best current estimate of the age of the universe is 13.75 ± 0.13 billion years (433.6 x 1015 seconds in SI units, or 13.75 Gigayears) within the Lambda-CDM concordance model. It is not known if something existed before the singularity that appeared at the moment of the Big Bang, nor if time is linear, since the expansion estimated by Hubble's law assumed a linear expansion, and later work indicates there may have been variations. The estimated changes in expansion are calculated to be both positive and negative, so Hubble and later estimates broadly agree.
The uncertainty range of ± 0.13 Ga for the age of the universe has been obtained by the agreement of a number of scientific research projects, such as microwave background radiation measurements by Wilkinson Microwave Anisotropy Probe and other probes. Measurements of the cosmic background radiation give the cooling time of the universe since the Big Bang, and measurements of the expansion rate of the universe can be used to calculate its approximate age by extrapolating backwards in time.

 

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