Universe | Wikipedia audio article
Channel: Subhajit Sahu
Date: 2018-12-24

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Universe


00:04:00 1 Definition
00:05:03 2 Etymology
00:05:26 2.1 Synonyms
00:06:20 3 Chronology and the Big Bang
00:11:48 4 Physical properties
00:13:01 4.1 Size and regions
00:15:45 4.2 Age and expansion
00:19:11 4.3 Spacetime
00:21:13 4.4 Shape
00:23:05 4.5 Support of life
00:23:50 5 Composition
00:27:05 5.1 Dark energy
00:28:20 5.2 Dark matter
00:29:13 5.3 Ordinary Matter
00:31:43 5.4 Particles
00:33:02 5.4.1 Hadrons
00:34:20 5.4.2 Leptons
00:36:17 5.4.3 Photons
00:37:50 6 Cosmological models
00:38:00 6.1 Model of the Universe based on general relativity
00:44:58 6.2 Multiverse hypothesis
00:45:07 7 Historical conceptions
00:48:11 7.1 Mythologies
00:49:10 7.2 Philosophical models
00:50:59 7.3 Astronomical concepts
00:54:19 8 See also
01:02:02 9 Notes



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- Socrates



SUMMARY
=======
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 the Sun is one of hundreds of billions of stars in 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 ...