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Earth is the third planet from the Sun. It is the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets. It is sometimes referred to as the world or the Blue Planet.

Earth formed approximately 4.54 billion years ago, and life appeared on its surface within its first billion years. Earth's biosphere then significantly altered the atmospheric and other basic physical conditions, which enabled the proliferation of organisms as well as the formation of the ozone layer, which together with Earth's magnetic field blocked harmful solar radiation, and permitted formerly ocean-confined life to move safely to land. The physical properties of the Earth, as well as its geological history and orbit, have allowed life to persist.

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Earth is the third planet from the Sun. It is the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets. It is sometimes referred to as the world or the Blue Planet.

Earth formed approximately 4.54 billion years ago, and life appeared on its surface within its first billion years. Earth's biosphere then significantly altered the atmospheric and other basic physical conditions, which enabled the proliferation of organisms as well as the formation of the ozone layer, which together with Earth's magnetic field blocked harmful solar radiation, and permitted formerly ocean-confined life to move safely to land. The physical properties of the Earth, as well as its geological history and orbit, have allowed life to persist. More

 
    BIG BANG : Formation of the Universe
  BIG BANG : Formation of the Universe
The Big Bang theory is the prevailing cosmological model for the earliest known periods of the universe and its subsequent large-scale evolution. It states that the Universe was in a very high density state and then expanded. If the known laws of phy...
 
    The Universe
  The Universe
The Universe is all of time and space and its contents. The Universe includes planets, stars, galaxies, the contents of intergalactic space, the smallest subatomic particles, and all matter and energy. The majority of matter and energy is most likely...
 
    FORMATION OF EARTH
  FORMATION OF EARTH
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets. It is sometimes referred to as the world, the Blue Planet, or b...
 
    The Nine Planets
  The Nine Planets
The Nine Planets is an overview of the history, mythology, and current scientific knowledge of each planet and the major moons in our solar system. Each page has my text and NASA's images, some have sounds and movies, most provide references to addit...
 
    The Sun, Center of our Solar System
  The Sun, Center of our Solar System
The Sun is the closest star to Earth and is the center of our solar system. A giant, spinning ball of very hot gas, the Sun is fueled by nuclear fusion reactions. The light from the Sun heats our planet and makes life possible. The Sun is also an act...
 
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  CAMBRIAN : Explosion of Life on Earth
The Cambrian is the first geological period of the Paleozoic Era, lasting from 541 to 485 million years ago (mya) and is succeeded by the Ordovician. Its subdivisions, and indeed its base, are somewhat in flux. The period was established by Adam Sedg...
 
    Pangaea, Supercontinent
  Pangaea, Supercontinent
Pangaea or Pangea was a supercontinent that existed during the late Paleozoic and early Mesozoic eras. It formed approximately 300 million years ago and then began to break apart after about 100 million years. Unlike the present Earth, much of the la...
 
    PERMIAN : Largest Mass Extinction
  PERMIAN : Largest Mass Extinction
The Permian is a geologic period and system which extends from 299 to 252 million years ago. It is the last period of the Paleozoic Era, following the Carboniferous Period and preceding the Triassic Period of the Mesozoic Era. The concept of the Perm...
 
    MESOZOIC : Age of Dinosaurs
  MESOZOIC : Age of Dinosaurs
The Mesozoic era is an interval of geological time from about 252 to 66 million years ago. It is also called the age of reptiles, a phrase introduced by the 19th century paleontologist Gideon Mantell who viewed it as dominated by reptiles such as Igu...
 
    Africa
  Africa
Africa is the world's second-largest and second most populous continent, after Asia. At about 30 million km² including its adjacent islands, it covers 5.9% of the Earth's total surface area, and 20.3% of the total land area. With over 840 million peo...
 
    North America
  North America
North America is a continent in the Northern Hemisphere and almost fully in the Western Hemisphere, bordered on the north by the Arctic Ocean, on the east by the North Atlantic Ocean, on the south by the Caribbean Sea, and on the west by the North Pa...
 
    South America
  South America
South America is a continent situated in the Western Hemisphere between the Pacific and Atlantic Oceans. Most of it is in the Southern Hemisphere. Commonly referred to as part of the Americas, like North America, South America is named after Amerigo...
 
    Europe
  Europe
Europe is conventionally considered one of the seven continents which, in this case, is more a cultural and political distinction than a physiogeographic one. Physically and geologically, Europe is a subcontinent or large peninsula, forming the weste...
 
    Oceania
  Oceania
Oceania is a geographical region consisting of numerous countries and territories mostly islands in the Pacific Ocean. The exact scope of Oceania is controversial, with varying interpretations including East Timor, Australia, New Zealand, or none...
 
    Asia
  Asia
Asia is the largest and most populous of the Earth's continents. It is traditionally defined as part of the landmass of Africa-Eurasia lying east of the Suez Canal, east of the Ural Mountains, and southeast of the Caucasus Mountains and the Caspian a...
 
    Antarctica
  Antarctica
Speculation over the existence of a "southern land" was not confirmed until the early 1820s when British and American commercial operators and British and Russian national expeditions began exploring the Antarctic Peninsula region and other areas sou...
 
    STONE AGE : The Human Era
  STONE AGE : The Human Era
The first species of the genus Homo, evolved in South and East Africa in the late Pliocene or early Pleistocene (2 - 2.5 million years before present) when it diverged from the Australopithecines (Australopithecines and Hominenes are collectively ref...
 
    ICE AGE : Extintion of Large Mammals
  ICE AGE : Extintion of Large Mammals
The last glacial period, popularly known as the Ice Age, was the most recent glacial period within the current ice age occurring during the last years of the Pleistocene, from approximately 110,000 to 12,000 years ago. Scientists consider this "ice a...
 
    NEOLITHIC : First Permanent Settlements
  NEOLITHIC : First Permanent Settlements
The Neolithic Era or New Stone age, was a period in the development of human technology, beginning about 10,200 BC, according to the ASPRO chronology, in some parts of the Middle East, and later in other parts of the world and ending between 4,500 an...
 
    BRONZE AGE :  First Writing
  BRONZE AGE : First Writing
The Bronze Age is a time period characterized by the use of bronze, proto-writing, and other early features of urban civilization. The Bronze Age is the second principal period of the three-age Stone-Bronze-Iron system, as proposed in modern times...
 
    Stonehenge
  Stonehenge
Stonehenge is a prehistoric monument located in the English county of Wiltshire, about 3.2 kilometres (2.0 mi) west of Amesbury and 13 kilometres (8.1 mi) north of Salisbury. One of the most famous sites in the world, Stonehenge is composed of earthw...
 
    The First Pyramids Built
  The First Pyramids Built
The first pyramid was the Step Pyramid at Saqqara, built for King Zoser in 2750 BC. This first application of large scale technology, however, is often attributed to Imhotep, the architect of the Step Pyramid. He was not a pharaoh, but was the Direct...
 
    Gilgamesh, King of Uruk, 1st Hero in History
  Gilgamesh, King of Uruk, 1st Hero in History
Gilgamesh is the main character in the Epic of Gilgamesh, an Akkadian poem that is considered the first great work of literature, and in earlier Sumerian poems. In the epic, Gilgamesh is a demigod of superhuman strength who builds the city walls of U...
 
    IRON AGE : Start of the Trojan War
  IRON AGE : Start of the Trojan War
The Iron Age is the period generally occurring after the Bronze Age, marked by the prevalent use of iron. The early period of the age is characterized by the widespread use of iron or steel. The adoption of these materials coincided with other cha...
 
    Queen of Sheba, Makeda
  Queen of Sheba, Makeda
Legends of the Queen of Sheba are common throughout Arabia, Persia, Ethiopia and Israel. In Arabian tradition, Balkis ruled with the heart of a woman but the head and hands of a man. Islamic stories portray Solomon as marrying the Queen. In contrast...
 
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  Homer, Greek Poet
In the Western classical tradition, Homer is the author of the Iliad and the Odyssey, and is revered as the greatest of Greek epic poets. These epics lie at the beginning of the Western canon of literature, and have had an enormous influence on the h...
 
    HELLENISTIC PERIOD
  HELLENISTIC PERIOD
The Hellenistic period is the period of ancient Greek and eastern Mediterranean history between the death of Alexander the Great in 323 BC and the emergence of the Roman Empire as signified by the Battle of Actium in 31 BC and the subsequent conquest...
 
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  Archimedes of Syracuse, Eureka!
Archimedes of Syracuse was an Ancient Greek mathematician, physicist, engineer, inventor, and astronomer. Although few details of his life are known, he is regarded as one of the leading scientists in classical antiquity. Generally considered the gre...
 
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  Eratosthenes, Measuring the Earth
Eratosthenes of Cyrene was a Greek mathematician, geographer, poet, astronomer, and music theorist. He was a man of learning, becoming the chief librarian at the Library of Alexandria. He invented the discipline of geography, including the terminolog...
 
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  Augustus, (Octavius) 1st Roman Emperor
Emperor Augustus of Rome was born with the given name Gaius Octavius on September 23, 63 B.C. He took the name Gaius Julius Caesar Octavianus (Octavian) in 44 B.C. after the murder of his great uncle, Julius Caesar. In his will Caesar had adopted Oct...
 
    ROMAN PERIOD
  ROMAN PERIOD
The Roman Empire was the post-Republican period of the ancient Roman civilisation, characterised by an autocratic form of government, headed by an Emperor, and large territorial holdings around the Mediterranean Sea in Europe, Africa, the Middle East...
 
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  Jesus Christ, of Nazareth
Jesus (64 BC to 3033 AD), also referred to as Jesus of Nazareth and Jesus of Galilee, is the central figure of Christianity, whom the teachings of most Christian denominations hold to be the Son of God. Christianity regards Jesus as the awaited Mes...
 
    BYZANTINE PERIOD
  BYZANTINE PERIOD
The Byzantine Empire was the predominantly Greek-speaking continuation of the eastern half of the Roman Empire during Late Antiquity and the Middle Ages. Its capital city was Constantinople (modern-day Istanbul), originally known as Byzantium. Often...
 
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  Saint Augustine, Bishop of Hippo
He was named the Christian bishop of Hippo (Annaba, Algeria) in 396, and devoted the remaining decades of his life to the formation of an ascetic religious community. Augustine argued against the skeptics that genuine human knowledge can be establish...
 
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  Attila, King of the Huns
Attila the Hun was the Emperor of the Huns from 434 until his death in 453. He was leader of the Hunnic Empire which stretched from Germany to the Ural River and from the River Danube to the Baltic Sea. During his rule, he was one of the most fearsom...
 
    MIDDLE AGES
  MIDDLE AGES
The Middle Ages was the middle period in a schematic division of European history into three 'ages': Classical civilization, the Middle Ages, and Modern Civilization. It is commonly considered as having lasted from the end of the Western Roman Empire...
 
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  Saint Benedict, Founder of Western Monasticism
Saint Benedict of Nursia is a Christian saint, honored by the Roman Catholic Church as the patron saint of Europe and students. Benedict founded twelve communities for monks at Subiaco, about 40 miles (64 km) to the east of Rome, before moving to Mon...
 
    Muhammad, Prophet of Islam
  Muhammad, Prophet of Islam
Muhammad is the central prophet of the Islamic faith. Born into a noble Quraish (Quraysh) clan, he was orphaned at an early age. He grew up to be a successful merchant, then turned contemplative; it's said that beginning when he was 40, Muhammad was...
 
    RENAISSANCE
  RENAISSANCE
The Renaissance (from French: Renaissance "re-birth", Italian: Rinascimento, from rinascere "to be reborn") was a cultural movement that spanned the period roughly from the 14th to the 17th century, beginning in Italy in the Late Middle Ages and late...
 
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  Thomas a Kempis, Author of The Imitation of Christ
Thomas is the great author of the world famous book, "The Imitation of Christ." His name will be remembered until the end of time, because of this famous work. Priests, nuns, and lay people have used it for hundreds of years, and it has helped many t...
 
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  Columbus, Discovers America - 1492
Christopher Columbus was an explorer, colonizer, and navigator, born in the Republic of Genoa, in northwestern Italy. Under the auspices of the Catholic Monarchs of Spain, he completed four voyages across the Atlantic Ocean that led to general Europe...
 
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  John Calvin, Theologian
John Calvin was an influential French theologian and pastor during the Protestant Reformation. He was a principal figure in the development of the system of Christian theology later called Calvinism. Originally trained as a humanist lawyer, he sudden...
 
    REFORMATION
  REFORMATION
The Protestant Reformation was the schism within Western Christianity initiated by Martin Luther, John Calvin, and other early Protestants. Although there had been significant attempts at reform before Luther (notably those of John Wycliffe and Jan H...
 
    Philip II of Spain
  Philip II of Spain
Philip II, king of Spain and Portugal, was born at Valladolid, the only son of the Holy Roman Emperor, Charles V and Isabella of Portugal. Philip II, the self-proclaimed leader of Counter-Reformation, assumed the throne in 1556 with a great deal of p...
 
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  Shakespeare, England's National Poet
William Shakespeare was an English poet, playwright and actor, widely regarded as the greatest writer in the English language and the world's pre-eminent dramatist. He is often called England's national poet and the "Bard of Avon". His extant works,...
 
    Galileo Galilei, Father of Modern Science
  Galileo Galilei, Father of Modern Science
Galileo Galilei was an Italian physicist, mathematician, astronomer, and philosopher who played a major role in the Scientific Revolution. His achievements include improvements to the telescope and consequent astronomical observations, and support fo...
 
    ENLIGHTENMENT, The Age of Reason
  ENLIGHTENMENT, The Age of Reason
The Age of Enlightenment was an intellectual movement in 18th-century Europe. The goal of the Enlightenment was to establish an authoritative ethics, aesthetics, and knowledge based on an "enlightened" rationality. The movement's leaders viewed thems...
 
    Isaac Newton, Theory of Gravitation
  Isaac Newton, Theory of Gravitation
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    Adam Smith, Father of Modern Economics
  Adam Smith, Father of Modern Economics
Adam Smith was a Scottish moral philosopher, pioneer of political economy, and a key figure in the Scottish Enlightenment. Smith is best known for two classic works: The Theory of Moral Sentiments (1759), and An Inquiry into the Nature and Causes...
 
    INDUSTRIAL REVOLUTION
  INDUSTRIAL REVOLUTION
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    Charles Darwin, Evolution Theory - 1859
  Charles Darwin, Evolution Theory - 1859
Charles Robert Darwin was an English naturalist who realised and presented compelling evidence that all species of life have evolved over time from common ancestors, through the process he called natural selection. The fact that evolution occurs beca...
 
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  Eduard Suess, Discovery Supercontinent
Eduard Suess was a geologist who was an expert on the geography of the Alps. He is responsible for discovering two of the Earth's major now-lost geographical features, the supercontinent Gondwana (proposed 1861) and the Tethys Ocean. Suess is cons...
 
    Albert Einstein, Relativity Theory - 1905
  Albert Einstein, Relativity Theory - 1905
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    Alfred Wegener, Discovery Plate Tectonics
  Alfred Wegener, Discovery Plate Tectonics
German climatologist and geophysicist who, in 1915, published as expanded version of his 1912 book The Origin of Continents and Oceans. This work was one of the first to suggest continental drift and plate tectonics. He suggested that a supercontinen...
 
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  20th CENTURY
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    World War I, WW1
  World War I, WW1
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  Clair Patterson, Calculated an age for the Earth
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    World War 2, WW2
  World War 2, WW2
World War 2 started when Germany invaded Poland without warning at 4.45am on the 1st September 1939. By the evening of the 3rd September, Britain and France were at war with Germany and within a week, Australia, New Zealand, Canada and South Africa h...
 
    21st CENTURY
  21st CENTURY
The twenty-first century is the first century of the third millennium (2001 - 3000). The increasing prevalence of global communications and encounters with other calendars (Islamic calendar, Chinese calendar, Persian calendar, Hebrew calendar) sugges...
 
    FUTURE
  FUTURE
The future is the portion of the timeline that is still to occur, i.e. the place in space-time where lie all events that still have not occurred. In this sense the future is opposed to the past (the set of moments and events that have already occurre...
 
       
 
         
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