NationMaster - Encyclopedia: List of time periods

The categorization of time into discrete named blocks is called periodization. This is a list of such named time periods as defined in various fields of study. Major categorization systems include cosmological (concerning the various time periods in the origin and evolution of our universe), geological (concerning time periods in the origin and evolution of earth ) and historical (concerning time periods in the origin, evolution of mankind). Look up time in Wiktionary, the free dictionary. ... Periodization is the attempt to categorize or divide time into discrete named blocks. ... Cosmology, from the Greek: ÎºÎ¿ÏƒÎ¼Î¿Î»Î¿Î³Î¯Î± (cosmologia, ÎºÏŒÏƒÎ¼Î¿Ï‚ (cosmos) order + Î»Î¿Î³Î¹Î± (logia) discourse) is the study of the Universe in its totality, and by extension, humanitys place in it. ... According to the Big Bang theory, the universe emerged from an extremely dense and hot state (singularity). ... Universe is a word derived from the Old French univers, which in turn comes from the Latin roots unus (one) and versus (a form of vertere, to turn). Based on observations of the observable universe, physicists attempt to describe the whole of space-time, including all matter and energy and... This article includes a list of works cited but its sources remain unclear because it lacks in-text citations. ... The planet Earth, photographed in the year 1972. ... Adjectives: Terrestrial, Terran, Telluric, Tellurian, Earthly Atmosphere Surface pressure: 101. ... History studies the past in human terms. ... This article or section does not adequately cite its references or sources. ... Look up Mankind in Wiktionary, the free dictionary. ...

Human time periods

Based on current and debatable evidence, the human race has found it's origins starting from about 250,000 years ago - when homo began to develop. It is broadly divided into prehistorical (before history began to be recorded) and historical periods (when written records began to be kept). Look up homo in Wiktionary, the free dictionary. ...

Prehistorical periods

In archaeology and anthropology, prehistory is subdivided around the three-age system. Names for archaeological periods vary enormously from region to region. ... Archaeology, archeology, or archÃ¦ology (from the Greek words Î±ÏÏ‡Î±Î¯Î¿Ï‚ = ancient and Î»ÏŒÎ³Î¿Ï‚ = word/speech/discourse) is the study of human cultures through the recovery, documentation and analysis of material remains and environmental data, including architecture, artefacts, biofacts, human remains, and landscapes. ... Anthropology is the study of the physical and social characteristics of humanity through the examination of historical and present geographical distribution, cultural history, acculturation, and cultural relationships. ... It has been suggested that this article or section be merged with Prehistoric man. ... The three-age system is a system of classifying human prehistory into three consecutive time periods, named for their respective predominant tool-making technologies: The Stone Age The Bronze Age The Iron Age The system is most apt in describing the progression of European society, although it has been used...

The dates for each age can vary by region, although the beginning of Mesolithic is usually considered to correspond to the beginning of the Holocene epoch on the geologic time scale at the end of the most recent Ice age, about 9400 BC. The Paleolithic or Palaeolithic (Greek Ï€Î±Î»Î±Î¹ÏŒÏ‚ paleos=old and Î»Î¯Î¸Î¿Ï‚ lithos=stone or the Old Stone Age) was the first period in the development of human technology of the Stone Age. ... An array of Neolithic artifacts, including bracelets, axe heads, chisels, and polishing tools. ... The Bronze Age is a period in a civilizations development when the most advanced metalworking has developed the techniques of smelting copper from natural outcroppings and alloys it to cast bronze. ... The Holocene epoch is a geological period that extends from the present day back to about 10,000 radiocarbon years, approximately 11,430 Â± 130 calendar years BP (between 9560 and 9300 BC). ... // For other uses, see time scale. ... Variations in CO2, temperature and dust from the Vostok ice core over the last 400 000 years For the animated movie, see Ice Age (movie). ... (Redirected from 10000 BC) (Pleistocene, Paleolithic – 10th millennium BC – 9th millennium BC – other millennia) Beginning of the Mesolithic, or Epipaleolithic time period, which is the first part of the Holocene epoch. ...

Historical periods

Classical antiquity is a broad term for a long period of cultural history centered on the Mediterranean Sea, which begins roughly with the earliest-recorded Greek poetry of Homer (7th century BC), and continues through the rise of Christianity and the fall of the Western Roman Empire (5th century AD... Iron Age Axe found on Gotland This article is about the archaeological period known as the Iron Age, for the mythological Iron Age see Iron Age (mythology). ... Ancient Mesopotamia was settled and conquered by numerous ancient civilizations. ... (7th millennium BC – 6th millennium BC – 5th millennium BC – other millennia) Events c. ... (Redirected from 1100 BC) Centuries: 13th century BC - 12th century BC - 11th century BC Decades: 1150s BC 1140s BC 1130s BC 1120s BC 1110s BC - 1100s BC - 1090s BC 1080s BC 1070s BC 1060s BC 1050s BC Events and Trends 1100 BC - Tiglath-Pileser I of Assyria conquers the Hittites... Excavated ruins of Mohenjo-daro. ... (34th century BC - 33rd century BC - 32nd century BC - other centuries) (5th millennium BC - 4th millennium BC - 3rd millennium BC) Events Major climate shift possibly due to shift in solar activity. ... (Redirected from 1300 BC) Centuries: 15th century BC - 14th century BC - 13th century BC Decades: 1350s BC 1340s BC 1330s BC 1320s BC 1310s BC - 1300s BC - 1290s BC 1280s BC 1270s BC 1260s BC 1250s BC Events and Trends Cecrops II, legendary King of Athens dies after a reign... The Old Kingdom is the name commonly given to that period in the 3rd millennium BC when Egypt attained its first continuous peak of civilization complexity and achievement â€“ this was the first of three so-called Kingdom periods, which mark the high points of civilization in the Nile Valley (the... (31st century BC - 30th century BC - 29th century BC - other centuries) (4th millennium BC - 3rd millennium BC - 2nd millennium BC) Events 2925 - 2776 BC - First Dynasty wars in Egypt 2900 BC - Beginning of the Early Dynastic Period I in Mesopotamia. ... (Redirected from 2000 BC) (21st century BC - 20th century BC - 19th century BC - other centuries) (3rd millennium BC - 2nd millennium BC - 1st millennium BC) Events 2064 - 1986 BC -- Twin Dynasty wars in Egypt 2000 BC -- Farmers and herders travel south from Ethiopia and settle in Kenya. ... The Middle Kingdom is: a old name for China a period in the History of Ancient Egypt, the Middle Kingdom of Egypt This is a disambiguation page â€” a navigational aid which lists pages that might otherwise share the same title. ... (Redirected from 2000 BC) (21st century BC - 20th century BC - 19th century BC - other centuries) (3rd millennium BC - 2nd millennium BC - 1st millennium BC) Events 2064 - 1986 BC -- Twin Dynasty wars in Egypt 2000 BC -- Farmers and herders travel south from Ethiopia and settle in Kenya. ... (Redirected from 1300 BC) Centuries: 15th century BC - 14th century BC - 13th century BC Decades: 1350s BC 1340s BC 1330s BC 1320s BC 1310s BC - 1300s BC - 1290s BC 1280s BC 1270s BC 1260s BC 1250s BC Events and Trends Cecrops II, legendary King of Athens dies after a reign... Remnants of advanced, stratified societies dating back to the Shang period have been found in the Yellow River Valley. ... (Redirected from 1800 BC) (19th century BC - 18th century BC - 17th century BC - other centuries) (3rd millennium BC - 2nd millennium BC - 1st millennium BC) Events 1787 - 1784 BC -- Amorite conquests of Uruk and Isin 1786 BC -- Egypt: End of Twelfth Dynasty, start of Thirteenth Dynasty, start of Fourteenth Dynasty 1766... (Redirected from 1200 BC) Centuries: 14th century BC - 13th century BC - 12th century BC Decades: 1250s BC 1240s BC 1230s BC 1220s BC 1210s BC - 1200s BC - 1190s BC 1180s BC 1170s BC 1160s BC 1150s BC Events and Trends 1204 BC - Theseus, legendary King of Athens is deposed after... The New Kingdom is the period in ancient Egyptian history between the 16th century BCE and the 11th century BC, covering the Eighteenth, Nineteenth, and Twentieth Dynasties of Egypt. ... (Redirected from 1300 BC) Centuries: 15th century BC - 14th century BC - 13th century BC Decades: 1350s BC 1340s BC 1330s BC 1320s BC 1310s BC - 1300s BC - 1290s BC 1280s BC 1270s BC 1260s BC 1250s BC Events and Trends Cecrops II, legendary King of Athens dies after a reign... Centuries: 9th century BC - 8th century BC - 7th century BC Decades: 750s BC 740s BC 730s BC 720s BC 710s BC - 700s BC - 690s BC 680s BC 670s BC 660s BC 650s BC Events and Trends 708 BC - Spartan immigrants found Taras (Tarentum, the modern Taranto) colony in southern Italy. ... Boundaries of the Western Zhou Dynasty (1050 - 771 BC) in China The Zhou Dynasty (Chinese: ; pinyin: ; Wade-Giles: Chou Ch`ao; 1122 BC to 256 BC (ref) followed the Shang (Yin) Dynasty and preceded the Qin Dynasty in China. ... (Redirected from 1200 BC) Centuries: 14th century BC - 13th century BC - 12th century BC Decades: 1250s BC 1240s BC 1230s BC 1220s BC 1210s BC - 1200s BC - 1190s BC 1180s BC 1170s BC 1160s BC 1150s BC Events and Trends 1204 BC - Theseus, legendary King of Athens is deposed after... Centuries: 7th century BC - 6th century BC - 5th century BC Decades: 550s BC - 540s BC - 530s BC - 520s BC - 510s BC - 500s BC - 490s BC - 480s BC - 470s BC - 460s BC - 450s BC Events and Trends 509 BC - Foundation of the Roman Republic 508 BC - Office of pontifex maximus created... The Temple to Athena, the Parthenon Ancient Greece is a period in Greek history that lasted for around three thousand years. ... Centuries: 12th century BC - 11th century BC - 10th century BC Decades: 1050s BC 1040s BC 1030s BC 1020s BC 1010s BC - 1000s BC - 990s BC 980s BC 970s BC 960s BC 950s BC Events and trends 1006 BC - David becomes king of the ancient Israelites (traditional date) 1002 BC - Death... This is a timeline of ancient Greece. ... This is a Timeline of events concerning ancient Rome, from the city foundation until the last attempt of the Roman Empire of the East to conquer Rome. ... Centuries: 7th century BC - 6th century BC - 5th century BC Decades: 550s BC - 540s BC - 530s BC - 520s BC - 510s BC - 500s BC - 490s BC - 480s BC - 470s BC - 460s BC - 450s BC Events and Trends 509 BC - Foundation of the Roman Republic 508 BC - Office of pontifex maximus created... Events August - The usurper Basiliscus is deposed and Zeno is restored as Eastern Roman Emperor. ... The Three Kingdoms period (Traditional Chinese characters: 三國, Simplified Chinese characters: 三国, pinyin Sānguó) is a period in the History of China. ... Events Han Xiandi abdicates his throne to Cao Pi, symbolizing the end of the Han Dynasty and the beginning of the Three Kingdoms period in China. ... Events The Chinese Jin Dynasty under Emperor Wu of Jin China unifies China by conquering the Kingdom of Wu, ending the Period of the Three Kingdoms. ... The Dark Ages (or Dark Age) is a metaphor with multiple meanings and connotations. ... As a means of recording the passage of time, the 4th century was that century which lasted from 301 to 400. ... Persian sfuckentist, Rhazes, distinguished smallpox from measles in the course of his writings. ... The Middle Ages formed the middle period in a traditional schematic division of European history into three ages: the classical civilization of Antiquity, the Middle Ages, and modern times, beginning with the Renaissance. ... This article is 150 kilobytes or more in size. ... Europe in 450 The 5th century is the period from 401 - 500 in accordance with the Julian calendar in the Christian Era. ... (14th century - 15th century - 16th century - other centuries) As a means of recording the passage of time, the 15th century was that century which lasted from 1401 to 1500. ... The Viking Age is the name of the period between 793 and 1066 AD in Scandinavia and Britain, following the Germanic Iron Age (and the Vendel Age in Sweden). ... Scandinavia is a historical and geographical region centered on the Scandinavian Peninsula in Northern Europe and includes the three kingdoms of Denmark, Norway and Sweden. ... This article is 150 kilobytes or more in size. ... Events Vikings sack the monastery of Lindisfarne, Northumbria. ... Events January 6 - Harold II is crowned September 20 - Battle of Fulford September 25 - Battle of Stamford Bridge September 29 - William of Normandy lands in England at Pevensey. ... The Nara period ) of the history of Japan covers the years from about AD 710 to 784. ... Events Saelred becomes king of Essex Ceolred becomes king of Mercia after his cousin Cenred abdicates to become a monk in Rome A storm separates the Channel Islands of Jethou and Herm Births Emperor Konin of Japan Deaths May 25 - Aldhelm, bishop and scholar Categories: 709 ... Events Leo III becomes pope Earliest recorded Viking raid on Ireland. ... Five Dynasties and Ten Kingdoms (Traditional Chinese: 五代十國 Simplified Chinese: 五代十国 Hanyu pinyin: Wǔdàishíguó) (907-960) was a period of political upheaval in China, between the Tang Dynasty and Song Dynasty. ... Events Oleg leads Kievan Rus in a campaign against Constantinople Yelü Abaoji establishes Liao (Khitan) dynasty Births Deaths Categories: 907 ... Events Edgar the Peaceable crowned King of England. ... The Sengoku period (Japanese: æˆ¦å›½æ™‚ä»£, Sengoku-jidai) or Warring States period, was a period of civil war in the history of Japan that spans from the middle 15th to the early 17th centuries. ... Events February 18 - George, Duke of Clarence, convicted of treason against his older brother Edward IV of England, is privately executed in the Tower of London. ... 1605 was a common year starting on Saturday of the Gregorian calendar (or a common year starting on Tuesday of the 10-day slower Julian calendar). ... The early modern period is a term used by historians to refer to the period in Western Europe and its first colonies, between the Middle Ages and modern society. ... This article is 150 kilobytes or more in size. ... This 14th-century statue from south India depicts the gods Shiva (on the left) and Uma (on the right). ... (17th century - 18th century - 19th century - more centuries) As a means of recording the passage of time, the 18th century refers to the century that lasted from 1701 through 1800. ... The Renaissance (French for rebirth, or Rinascimento in Italian), was a cultural movement in Italy (and in Europe in general) that began in the late Middle Ages, and spanned roughly the 14th through the 17th century. ... This article is 150 kilobytes or more in size. ... This 14th-century statue from south India depicts the gods Shiva (on the left) and Uma (on the right). ... (15th century - 16th century - 17th century - more centuries) As a means of recording the passage of time, the 16th century was that century which lasted from 1501 to 1600. ... The Age of Discovery or Age of Exploration was a period from the early 15th century and continuing into the early 17th century, during which European ships traveled around the world to search for new trading routes and partners to feed burgeoning capitalism in Europe. ... This article is 150 kilobytes or more in size. ... (14th century - 15th century - 16th century - other centuries) As a means of recording the passage of time, the 15th century was that century which lasted from 1401 to 1500. ... (16th century - 17th century - 18th century - more centuries) As a means of recording the passage of time, the 17th century was that century which lasted from 1601-1700. ... The Elizabethan Era is the period associated with the reign of Queen Elizabeth I (1558 - 1603) and is often considered to be a golden age in English history. ... Events January 7 - French troops led by Francis, Duke of Guise take Calais, the last continental possession of England July 13 - Battle of Gravelines: In France, Spanish forces led by Count Lamoral of Egmont defeat the French forces of Marshal Paul des Thermes at Gravelines. ... King James I of England/VII of Scotland, the first monarch to rule the Kingdoms of England and Scotland at the same time Events March - Samuel de Champlain, French explorer, sails to Canada March 24 - Elizabeth I of England dies and is succeeded by her cousin King James I of... The Reformation was a movement in the years of the 16th century to reform the Catholic Church in Western Europe. ... This article is 150 kilobytes or more in size. ... (15th century - 16th century - 17th century - more centuries) As a means of recording the passage of time, the 16th century was that century which lasted from 1501 to 1600. ... The Age of Enlightenment refers to the 18th century in European philosophy, and is often thought of as part of a larger period which includes the Age of Reason. ... This article is 150 kilobytes or more in size. ... (17th century - 18th century - 19th century - more centuries) As a means of recording the passage of time, the 18th century refers to the century that lasted from 1701 through 1800. ... The Tokugawa shogunate or Tokugawa bakufu (å¾³å·å¹•åºœ) (also known as the Edo bakufu) was a feudal military dictatorship of Japan established in 1603 by Tokugawa Ieyasu and ruled by the shoguns of the Tokugawa family until 1868. ... Cast Crew Modern Times is a 1936 film by Charlie Chaplin that has his famous Little Tramp character struggling to survive in the modern, industrialized world. ... This article is 150 kilobytes or more in size. ... (17th century - 18th century - 19th century - more centuries) As a means of recording the passage of time, the 18th century refers to the century that lasted from 1701 through 1800. ... (19th century - 20th century - 21st century - more centuries) Decades: 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s As a means of recording the passage of time, the 20th century was that century which lasted from 1901–2000 in the sense of the Gregorian calendar (1900–1999... A Watt steam engine. ... This article is 150 kilobytes or more in size. ... (17th century - 18th century - 19th century - more centuries) As a means of recording the passage of time, the 18th century refers to the century that lasted from 1701 through 1800. ... Alternative meaning: Nineteenth Century (periodical) (18th century — 19th century — 20th century — more centuries) As a means of recording the passage of time, the 19th century was that century which lasted from 1801-1900 in the sense of the Gregorian calendar. ... The Napoleonic Era is a period in the History of France and Europe. ... 1799 was a common year starting on Tuesday (see link for calendar). ... April 5-12: Mount Tambora explodes, changing climate. ... Queen Victoria (shown here on the morning of her Ascension to the Throne, 20 June 1837) gave her name to the historic era The Victorian era of the United Kingdom marked the height of the British industrial revolution and the apex of the British Empire. ... Queen Victoria, Queen of the United Kingdom (1837 - 1901) 1837 (MDCCCXXXVII) was a common year starting on Sunday (see link for calendar). ... 1901 (MCMI) was a common year starting on Tuesday (link will display calendar) of the Gregorian calendar (or a common year starting on Wednesday of the 13-day-slower Julian calendar). ... The Edwardian period or Edwardian era in the United Kingdom is the period 1901 to 1910, the reign of King Edward VII. It succeeded the Victorian period and is sometimes extended to include the period up to the sinking of the RMS Titanic in 1912, the start of World War... 1901 (MCMI) was a common year starting on Tuesday (link will display calendar) of the Gregorian calendar (or a common year starting on Wednesday of the 13-day-slower Julian calendar). ... 1910 (MCMX) was a common year starting on Saturday (link will display calendar) of the Gregorian calendar or a common year starting on Sunday of the 13-day slower Julian calendar. ... History of Japan Paleolithic Jomon Yayoi Yamato period ---Kofun period ---Asuka period Nara period Heian period Kamakura period Muromachi period Azuchi-Momoyama period ---Nanban period Edo period Meiji period Taisho period Showa period ---Japanese expansionism ---Occupied Japan ---Post-Occupation Japan Heisei The Meiji period (Japanese: Meiji Jidai 明治&#26178... 1868 (MDCCCLXVIII) was a leap year starting on Wednesday (see link for calendar) of the Gregorian calendar or a leap year starting on Friday of the 12-day-slower Julian calendar. ... 1912 (MCMXII) was a leap year starting on Monday in the Gregorian calendar (or a leap year starting on Tuesday in the 13-day-slower Julian calendar). ... This article is becoming very long. ... 1914 (MCMXIV) was a common year starting on Thursday (see link for calendar). ... 1918 (MCMXVIII) was a common year starting on Tuesday of the Gregorian calendar (see link for calendar) or a common year starting on Wednesday of the Julian calendar. ... Europe between 1929 and 1938 The Interwar period (also interbellum) is understood within Western culture to be the period between the end of the First World War and the beginning of the Second World War in Europe, specifically 11 November 1918 to 1 September 1939. ... 1939 (MCMXXXIX) was a common year starting on Sunday (link will display full year calendar). ... Combatants Allied powers: China France Great Britain Soviet Union United States and others Axis powers: Germany Italy Japan and others Commanders Chiang Kai-shek Charles de Gaulle Winston Churchill Joseph Stalin Franklin Roosevelt Adolf Hitler Benito Mussolini Hideki TÅjÅ Casualties Military dead: 17,000,000 Civilian dead: 33,000... 1945 (MCMXLV) was a common year starting on Monday. ... For other uses, see Cold War (disambiguation). ... 1989 (MCMLXXXIX) was a common year starting on Sunday of the Gregorian calendar. ... It has been suggested that Digital Age be merged into this article or section. ... 1971 (MCMLXXI) was a common year starting on Friday. ... 1991 (MCMXCI) was a common year starting on Tuesday of the Gregorian calendar. ... The Space Shuttle takes off on a manned mission to space. ... 1957 (MCMLVII) was a common year starting on Tuesday of the Gregorian calendar. ... Motto: (German for Unity and Justice and Freedomâ€) Anthem: (3rd stanza) also called Capital Berlin istian Democratic Union (Germany) {{{official_languages}}} Government {{{government_type}}} Formation - Holy Roman Empire 843 (Treaty of Verdun) - Unification January 18, 1871 - Federal Republic May 23, 1949 - Reunification October 3, 1990 Accession to EU March 25, 1953 (West... 1991 is a common year starting on Tuesday of the Gregorian calendar. ... September 2001 : January - February - March - April - May - June - July - August - September - October - November - December Events September 4 - Google is awarded U.S. Patent 6,285,999, for the PageRank search algorithm used in the Google search engine September 5 - Perus attorney general files homicide charges against ex-President Alberto...

Calendar systems

Various societies in the past have created calendars to record events, such as religious observances and agricultural tasks. A common characteristic of most known calendars is that they measure time in relation to a particular point in history, known as the epoch date. A period between epoch dates is known as a calendar era. A page from the Hindu calendar 1871-72. ... In telecommunication, an epoch date is a date in history, chosen as the reference date from which time is measured. ... A calendar era is the year numbering system used by a calendar. ...

Mythological and astrological time periods

Position of vernal equinox occurring in Pisces after leaving Aries constellation (through the precession of the equinoxes backward motion). ... Position of vernal equinox occurring in Pisces after leaving Aries constellation (through the precession of the equinoxes backward motion). ... Position of vernal equinox occurring in Pisces after leaving Aries constellation (through the precession of the equinoxes backward motion). ... The Age of Pisces is one of the twelve astrological ages. ... The Age of Aquarius (starting around the 27th century) is one of the twelve astrological ages. ... The bust of Zeus found at Otricoli (Sala Rotonda, Museo Pio-Clementino, Vatican) Greek mythology is the telling of stories created by the ancient Greeks, concerning their gods and heroes, the nature of the world and their own cult and ritual practices. ... This article or section does not adequately cite its references or sources. ... A silver age is a name often given to a particular period within a history, typically as a lesser and later successor to a golden age, the metal silver generally being valuable, but less so than gold. ... The Heroic Age was the period of Greek mythological history that lay between the purely divine events of the Theogony and Titanomachy and the advent of historical time after the Trojan War. ... The Aztec civilization recognized many gods and supernatural creatures. ...

Cosmological time periods

14.6 billion years ago: The Big Bang.

Because of the scales involved (both very large and very small), cosmological time periods are usually described in seconds. In this table, each row is defined in seconds after the Big Bang, with earliest at the top of the chart. A graphical timeline is available here: Graphical timeline of the Big Bang This timeline of the Big Bang describes the events that have occurred and will occur according to the scientific theory of the Big Bang, using the cosmological time parameter of comoving coordinates. ... Look up second in Wiktionary, the free dictionary. ... According to the Big Bang theory, the universe emerged from an extremely dense and hot state (singularity). ...

100 seconds to 300,000 years after the big bang - Epoch of Nucleosynthesis In physics, the Planck time (tP), is the unit of time in the system of natural units known as Planck units. ... Named after Max Planck, in cosmology the Planck epoch (or Planck Era) is the earliest period of time in the history of the universe, from zero to 10-43 seconds (one Planck time), during which all four fundamental forces were unified and elementary particles did not yet exist. ... The inflationary epoch is the term used in cosmology to describe the brief time in the very early universe when, according to inflation theory, the universe was expanding exponentially. ... Grand unification, grand unified theory, or GUT is a theory in physics that unifies the strong interaction and electroweak interaction. ... In physics, the electroweak theory presents a unified description of two of the four fundamental forces of nature: electromagnetism and the weak nuclear force. ... In particle physics, a hadron is a subatomic particle which experiences the nuclear force. ... In physics, a particle is a lepton if it has a spin of 1/2 and does not experience the strong nuclear force. ... In cosmology, Big Bang nucleosynthesis (or primordial nucleosynthesis) refers to the production of nuclei other than H-1, the normal, light hydrogen, during the early phases of the universe, shortly after the Big Bang. ...

300,000 years on from the Big Bang - Epoch of Galaxies This article is about a celestial body. ...

Formation of Population III stars

The first stars were formed from the Hydrogen and Helium formed in the Big Bang were short lived massive Population III stars. Nuclear processes in these stars converted the Hydrogen and Helium into metals and other heavier elements. As the Population III stars died these heavier elements were released. General Name, Symbol, Number hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1, 1, s Appearance colorless Atomic mass 1. ... General Name, Symbol, Number helium, He, 2 Chemical series noble gases Group, Period, Block 18, 1, s Appearance colorless Standard atomic weight 4. ... According to the Big Bang theory, the universe emerged from an extremely dense and hot state (singularity). ... Population III stars are a hypothetical population of extremely massive stars that are believed to have been formed in the early universe. ... Population III stars are a hypothetical population of extremely massive stars that are believed to have been formed in the early universe. ...

Formation of Population II stars

Population II stars contain metals formed in the Population III stars. These were longer lived than the Population III stars and some of them are still around. In addition to the metals these inherited from the Population III stars the Population II stars also formed metals by nuclear reactions and when the stars died much of that material was returned to be used as the building blocks for the next generation of stars. Metal-poor is a term that is used to describe the chemical make up of an object. ... Population III stars are a hypothetical population of extremely massive stars that are believed to have been formed in the early universe. ...

5 Billion Years ago - Formation of Population I stars

Population I stars are also known as metal rich stars. Our own sun is a Population I star and was formed about 5 billion years ago. To meet Wikipedias quality standards, this article or section may require cleanup. ...

Geologic time periods

The geologic time scale covers the extent of the existence of Earth, from about 4600 million years ago to the present day. It is marked by Global Boundary Stratotype Sections and Points. Geologic time units are (in order of descending specificity) eons, eras, periods, epochs, and ages; and the corresponding chronostratigraphic units, which measure "rock-time", are eonothems, erathems, systems, series, and stages. // For other uses, see time scale. ... This is a list of Global Boundary Stratotype Sections and Points. ... // For other uses, see time scale. ... A Global Boundary Stratotype Section and Point, abbreviated GSSP, is an internationally agreed upon stratigraphic section which serves as the reference section for a particular boundary on the geologic timescale. ... Chronostratigraphy is the branch of stratigraphy that studies the age of rock strata in relation to time. ...

The second and third timelines are each subsections of their preceding timeline as indicated by asterisks. The Cenozoic is sometimes divided into the Quaternary and Tertiary periods, although their use is no longer official. For other uses, see Quaternary (disambiguation). ... For other uses, see Tertiary (disambiguation). ...