The universe is the cradle of life, a never-ending source of every form of life and the expression of its creation .
The A and Ω, the end of the beginning and the beginning of the end. The Universe is the totality of everything that exists, has existed, and ever will exist.
The Universe includes all of space time; the entire contents of outer space; all matter, energy, dark matter, and dark energy; all galaxies, stars, and planets; all humans and every living thing; all molecules, atoms, subatomic particles, photons; all physical constants, physical laws and fundamental interactions. The Universe can even be understood to encompass all of mathematics, all concepts and ideas, and all thoughts and emotions.
The part of the Universe that we can see, referred to as the observable universe, has a diameter of about 93 billion light years (28 billion parsecs) and a volume of 4×1083 liters.
The size of the whole Universe is not known – it may be infinite. Considering only ordinary matter, the density of the.
Universe is 9.9 x 10−30 g/cm3, equivalent to a mass density of 5.9 protons per cubic meter.
Space is expanding, and the rate of its expansion is increasing. Astronomical observations have led to inferences of the earlier stages of the Universe, which appear to have been governed by the same physical laws and constants
The Universe is the totality of existence. This includes planets, stars, galaxies, the contents of intergalactic space, the smallest subatomic particles, and all matter and energy, the majority of which are most likely in the form of dark matter and dark energy.
The most popular theory of our universe’s origin centers on a cosmic cataclysm unmatched in all of history—the big bang. This theory was born of the observation that other galaxies are moving away from our own at great speed, in all directions, as if they had all been propelled by an ancient explosive force.
Before the big bang, scientists believe, the entire vastness of the observable universe, including all of its matter and radiation, was compressed into a hot, dense mass just a few millimeters across. This nearly incomprehensible state is theorized to have existed for just a fraction of the first second of time.
Big bang proponents suggest that some 10 billion to 20 billion years ago, a massive blast allowed all the universe’s known matter and energy—even space and time themselves—to spring from some ancient and unknown type of energy.
The theory maintains that, in the instant—a trillion-trillionth of a second—after the big bang, the universe expanded with incomprehensible speed from its pebble-size origin to astronomical scope. Expansion has apparently continued, but much more slowly, over the ensuing billions of years.
Scientists can’t be sure exactly how the universe evolved after the big bang. Many believe that as time passed and matter cooled, more diverse kinds of atoms began to form, and they eventually condensed into the stars and galaxies of our present universe.
According to the standard Big Bang model, the universe was born during a period of inflation that began about 13.7 billion years ago. Like a rapidly expanding balloon, it swelled from a size smaller than an electron to nearly its current size within a tiny fraction of a second.
Initially, the universe was permeated only by energy. Some of this energy congealed into particles, which assembled into light atoms like hydrogen and helium. These atoms clumped first into galaxies, then stars, inside whose fiery furnaces all the other elements were forged.
This is the generally agreed-upon picture of our universe’s origins as depicted by scientists. It is a powerful model that explains many of the things scientists see when they look up in the sky, such as the remarkable smoothness of space-time on large scales and the even distribution of galaxies on opposite sides of the universe.
Space is the boundless three-dimensional extent in which objects and events have relative position and direction. Physical space is often conceived in three linear dimensions, although modern physicists usually consider it, with time, to be part of a boundless four-dimensional continuum known as space time.
The cosmos is a complex and orderly system; the opposite of chaos. It is the universe regarded as an ordered system.
In other words, Space is just like the matrix where Universe and the Cosmos are present. Nothing is just the Space without anything.
The world that we live in is very vast and boundless. While the human race is confined and live in a small portion of the world, people are aware of the existence of other planets and galaxies as well as many other things in the universe and the cosmos.
“Cosmos” is defined as a harmonious and orderly whole, a system that is governed not by human or supernatural laws but by natural law. It is used to refer to objects that exist naturally especially those that can be seen in the sky. The term “cosmos” has two connotations. It comes from the Greek word “cosmos” which means “order, good order,” or “orderly arrangement” from which the verb “kosmein” which means “arrange” or “adorn” is derived and passed on to the English language.
It was first used by Pythagoras, a 6th century Greek philosopher, mathematician (he discovered the Pythagorean Theorem), and founder of the religious movement Pythagoreanism to refer to the whole physical world or the universe.
“Universe” is defined as “everything that exists including all matter and energy, the Earth, and everything in it together with extraterrestrial or celestial bodies such as the galaxies, stars, meteors, and everything that can be found in intergalactic space.” It is everything that existed, that is existing, and will exist. It has three elements, namely; space and time or the vacuum, matter and energy that occupy space and time, and the physical laws that govern them which have been constant throughout its history.
The concept of the universe was first developed by the Ancient Greeks. The term “universe” comes from the Latin word “universus” which means “whole, entire, all together, or turned into one” which was first used by Cicero. It entered the English language through the Old French “univers” which means “the whole world” which was in turn based on the Greek word “holos” which means “whole.” It appeared in the English language in 1589 in Puttenham’s work “The Arte of English Poesie” but was first used in 1385 in Chaucer’s poem “Troilus and Criseyde.”
The words “cosmos” and “universe” are used synonymously as they refer to the same concept which is the world or nature. “Universe” seems to have a narrower or smaller scope than “cosmos,” though, and “cosmos” signifies a larger and more complex system.