NASA.gov brings you the latest images, videos and news from America's space agency. Get the latest updates on NASA missions, watch NASA TV live, and learn about our quest to reveal the unknown and benefit all humankind.The leading flat-earther theory holds that Earth is a disc with the Arctic Circle in the center and Antarctica, a 150-foot-tall (45 meters) wall of ice, around the rim. NASA employees, they say ...Meet the artist. Sarah Jacoby is an illustrator and a production designer at Tinybop. The landscape she created to represent our planet in The Earth was a 32-foot long Photoshop file. But the biggest challenge wasn’t scale, it was figuring out an interesting and colorful way to draw dirt. Learn more about Sarah in our interview. Earth science research, climate change, and global warming. The latest news and updates from Phys.org One is the heat that Earth inherited during its formation 4.5 billion years ago. The Earth was made from the solar nebula , a gigantic gaseous cloud, amid endless collisions and mergings between ...Earth is made up of complex, interactive systems that create a constantly changing world that we are striving to understand. From the vantage point of space, we are able to observe our planet globally, using sensitive instruments to understand the delicate balance among its oceans, air, land, and life. NASA satellite observations help study and ...Examples of When to Capitalize Earth in a Sentence. The Blue Whale is the largest animal on Earth. It takes sunlight 8 ⅓ minutes to reach us here on Earth. Falling stars are meteorites burning up in Earth’s atmosphere. The history of Earth’s existence can be found in geological studies. Earth is the third planet from the Sun.Starting at the center, Earth is composed of four distinct layers. They are, from deepest to shallowest, the inner core, the outer core, the mantle and the crust. Except for the crust, no one has ever explored these layers in person. In fact, the deepest humans have ever drilled is just over 12 kilometers (7.6 miles).When Earth first formed 4.6 billion years ago, a day was about six hours long. Since then, the Earth has slowed down. It takes longer to spin around. Every 100 years, the day gets 0.0017 seconds longer. Why? The moon is slowing down Earth’s rotation with the tides it creates.Earth is the third planet from the Sun and the only astronomical object known to harbor life. This is enabled by Earth being a water world, the only one in the Solar System sustaining liquid surface water. Almost all of Earth's water is contained in its global ocean, covering 70.8% of Earth's surface.18 hours ago · How did researchers determine the meteorite's age? Krestianinov and his colleagues analyzed lead and uranium isotopes in Erg Chech 002 and determined its lead-isotopic age as about 4.566 billion ... From the Earth Missouri dispensaries offer curbside pickup and delivery services in select areas, including Downtown, Westside, Brookside, Independence, and Raytown. Other things to note: To guarantee a smooth ride, please ensure exact change on hand, as drivers can only provide up to $5 in change.Earth is the densest major body in the solar system. Density of planet Earth is about 5.52 g/cm 3 or 5 520 kg/m 3. Water, as you might know, has a density of 1000 kg/m 3 at 3.98 degrees centigrade and at one atmosphere of pressure. Orbital Data: Sidereal period (Time Earth needs to orbit the sun once) 365.256 days. Rotation: Earth - Atmosphere, Climate, Ozone: Earth is surrounded by a relatively thin atmosphere (commonly called air) consisting of a mixture of gases, primarily molecular nitrogen (78 percent) and molecular oxygen (21 percent). Also present are much smaller amounts of gases such as argon (nearly 1 percent), water vapour (averaging 1 percent but highly variable in time and location), carbon dioxide (0 ... A. A scene in Christopher Nolan's Oppenheimer hinges around the worry some Manhattan Project scientists felt that the first atomic bomb test would ignite Earth's atmosphere. Edward Teller, so the ...One is the heat that Earth inherited during its formation 4.5 billion years ago. The Earth was made from the solar nebula , a gigantic gaseous cloud, amid endless collisions and mergings between ...A. A scene in Christopher Nolan's Oppenheimer hinges around the worry some Manhattan Project scientists felt that the first atomic bomb test would ignite Earth's atmosphere. Edward Teller, so the ...10 hours ago · A. A scene in Christopher Nolan's Oppenheimer hinges around the worry some Manhattan Project scientists felt that the first atomic bomb test would ignite Earth's atmosphere. Edward Teller, so the ... From the Earth Missouri dispensaries offer curbside pickup and delivery services in select areas, including Downtown, Westside, Brookside, Independence, and Raytown. Other things to note: To guarantee a smooth ride, please ensure exact change on hand, as drivers can only provide up to $5 in change.Bibliography. Earth is our home planet, the only place in the universe where we know for certain that life exists. Earth formed over 4.6 billion years ago from a swirling cloud of gas and dust ...Earth is the planet we live on, one of eight planets in our solar system and the only known place in the universe to support life. Earth is the third planet from the sun, after Mercury and Venus, and before Mars. It is about 150 million kilometers (about 93 million miles) from the sun.Measuring the Circumference of the Earth. More than 2,000 years ago Eratosthenes compared the position of the Sun’s rays in two locations to calculate the spherical size of the Earth with reasonable accuracy. Eratosthenes was born in the Greek colony Cyrene, now the city of Shahhat, Libya. As a young man, he traveled to Athens to pursue his ...Earth's circumference (the distance all the way around the equator) is 24,901 miles (40,075 kilometers). Its diameter (the distance from one side to the other through Earth's center) is 7,926 miles (about 12,756 kilometers).Earth definition: Earth or the Earth is the planet on which we live. People usually say Earth when they are... | Meaning, pronunciation, translations and examples1. Earth’s non-mythological etymology is unique among planets. Earth is the only planet in our solar system that doesn’t get its name from Greek or Roman mythology.Earth is the only special planet of the Solar system that contains life due to the presence of liquid water in abundance and free atmospheric oxygen. Earth has an oblate spheroidal shape. The mass of Earth is approximately 5.97x10²⁴. Earth revolves around the sun and completes its one round in 365.26 days.Earth Day is an annual celebration that honors the achievements of the environmental movement and raises awareness of the need to protect Earths natural resources for future generations. The first Earth Day was held April 22, 1970. Here, Sen. Edmund Muskie (D-Maine) author of the 1970 Clean Air Act, addresses an estimated 40,000-60,000 people ...Starting at the center, Earth is composed of four distinct layers. They are, from deepest to shallowest, the inner core, the outer core, the mantle and the crust. Except for the crust, no one has ever explored these layers in person. In fact, the deepest humans have ever drilled is just over 12 kilometers (7.6 miles).Jan 23, 2023 · One is the heat that Earth inherited during its formation 4.5 billion years ago. The Earth was made from the solar nebula , a gigantic gaseous cloud, amid endless collisions and mergings between ... Earth - Atmosphere, Climate, Ozone: Earth is surrounded by a relatively thin atmosphere (commonly called air) consisting of a mixture of gases, primarily molecular nitrogen (78 percent) and molecular oxygen (21 percent). Also present are much smaller amounts of gases such as argon (nearly 1 percent), water vapour (averaging 1 percent but highly variable in time and location), carbon dioxide (0 ... May 19, 2016 · Add a comment. -1. Earth is an entity. The Earth is a planet. Although there is no universally accepted grammar rule regarding the usage of The before Earth but in most scenarios when pointing to Earth as a proper noun we ideally use The before it. Share. Improve this answer. Follow. answered May 19, 2016 at 9:38. Science Reference Planet Earth, explained Our home planet provides us with life and protects us from space. By Michael Greshko 7 min read Earth, our home planet, is a world unlike any other....The Earth has a radius of 2.439 kilometers / 1.516 miles and a diameter of only 12.742 km / 7.917 mi. When it comes to weight, the mass of Earth is equivalent to 5.9 quadrillion kg. In the Solar System, our Earth is the fifth largest planet and the largest of the terrestrial planets.Jul 25, 2022 · 27. The thinnest of all the layers is the crust, which is on an average 30 kilometers deep on an average on the ground. 28. Earth also has the largest natural satellite as compared to any other planet considering the size of Earth and the moon (the Moon is approximately 27% the size of the Earth.) 29. A study published last year found that 1.27 million people died in 2019 from infections resistant to antimicrobial drugs. The annual death toll could reach 10 million by 2050, according to the ...Download Google Earth in Apple App Store Download Google Earth in Google Play Store Launch Earth. keyboard_arrow_down. Create stories and maps. With creation tools, you can draw on the map, add ...Dec 15, 2020 · The earth is split into four major layers: the crust, the mantle, the outer core and the inner core. The crust is what humans live on, and it consists of only one percent of the Earth's mass. The centre of the Earth is a solid ball of nickel and iron roughly 70% the size of the moon. Geologists have come a long way in terms of the collective ... Earth is estimated to have formed around 4.5 billion years ago – almost one-third of the age of the universe – through accretion from the solar nebula. Earth is the third planet from the Sun, at a distance of 1 AU or 147 million km / 91 million mi. It is the fifth-largest planet in the Solar System, being the largest of the terrestrial planets.Nov 6, 2016 · The word "earth" means "ground" or "soil" or "the solid surface of Earth". The word "earth" has a small letter at the beginning. It sometimes needs a 'the', but sometimes is used as a 'mass noun' like 'water' or 'air'. When you say "on the earth", it is similar to saying "on the sea" or "on an island". Sep 17, 2015 · Earth’s axial tilt (or obliquity) and its relation to the rotation axis and plane of orbit. Credit: Wikipedia Commons. The Earth has an orbital period of 365.25 d ays, which is the equivalent of ... Add a comment. -1. Earth is an entity. The Earth is a planet. Although there is no universally accepted grammar rule regarding the usage of The before Earth but in most scenarios when pointing to Earth as a proper noun we ideally use The before it. Share. Improve this answer. Follow. answered May 19, 2016 at 9:38.Download Google Earth in Apple App Store Download Google Earth in Google Play Store Launch Earth. keyboard_arrow_down. Create stories and maps. With creation tools, you can draw on the map, add ...A newly discovered space rock about 6.5 feet wide (2 meters) zipped past Earth today at a distance five times closer than GPS satellites orbit. The small asteroid, designated C9FMVU2, was first ...Orbital parameters Semimajor axis (10 6 km) 149.598 Sidereal orbit period (days) 365.256 Tropical orbit period (days) 365.242 Perihelion (10 6 km) 147.095 Aphelion (10 6 km) 152.100 Mean orbital velocity (km/s) 29.78 Max. orbital velocity (km/s) 30.29 Min. orbital velocity (km/s) 29.29 Orbit inclination (deg) 0.000 Orbit eccentricity 0.0167 Sidereal rotation period (hrs) 23.9345 Length of day ... From the Earth Missouri dispensaries offer curbside pickup and delivery services in select areas, including Downtown, Westside, Brookside, Independence, and Raytown. Other things to note: To guarantee a smooth ride, please ensure exact change on hand, as drivers can only provide up to $5 in change.Earth orbit (yellow) compared to a circle (gray) Earth orbits the Sun at an average distance of 149.60 million km (92.96 million mi) [1] in a counterclockwise direction as viewed from above the Northern Hemisphere. One complete orbit takes 365.256 days (1 sidereal year ), during which time Earth has traveled 940 million km (584 million mi). [2]In the 1800s, as scientists sought to determine the age of the planet, they made a few missteps. In 1862, a famous Irish physicist and mathematician, Lord Kelvin, estimated that Earth was between 20-million and 400-million years old. While that is an enormous span of time, even an age of 400 million years would make the planet quite young in ...The Moon is a large chunk of Earth that detached itself from our planet after a colossal collision occurred around 4.45 billion years ago when the Earth was merely 50 million years old, hence the reason why the Moon is so crucial in determining our planet’s age.10 Things: Dust in the Wind (on Mars and Well Beyond) Frozen: Ice on Earth and Well Beyond. US-European Satellite Will Make World's First Global Freshwater Survey. nasa.gov. NASA, SpaceX Launch Climate Science Research, More to Space Station. nasa.gov. NASA's ECOSTRESS Sees Las Vegas Streets Turn Up the Heat. nasa.gov.May 19, 2016 · Add a comment. -1. Earth is an entity. The Earth is a planet. Although there is no universally accepted grammar rule regarding the usage of The before Earth but in most scenarios when pointing to Earth as a proper noun we ideally use The before it. Share. Improve this answer. Follow. answered May 19, 2016 at 9:38. earth definition: 1. the planet third in order of distance from the sun, between Venus and Mars; the world on which…. Learn more.Jan 23, 2023 · One is the heat that Earth inherited during its formation 4.5 billion years ago. The Earth was made from the solar nebula , a gigantic gaseous cloud, amid endless collisions and mergings between ... Examples of When to Capitalize Earth in a Sentence. The Blue Whale is the largest animal on Earth. It takes sunlight 8 ⅓ minutes to reach us here on Earth. Falling stars are meteorites burning up in Earth’s atmosphere. The history of Earth’s existence can be found in geological studies. Earth is the third planet from the Sun. Four asteroids are passing by the Earth this week, and a New Mexico observatory is part of the network watching them go past. On Friday, Asteroids QC5 and GE will go through the solar system at 2. ...Earth is made up of land, air, water and life. Mountains, valleys and flat places make up the land. The air is made of different gases. One of the gases is oxygen. Oceans, lakes, rivers, streams, rain, snow and ice are made of water. Earth has many different kinds of life. People, animals and plants live on Earth.Nov 6, 2016 · The word "earth" means "ground" or "soil" or "the solid surface of Earth". The word "earth" has a small letter at the beginning. It sometimes needs a 'the', but sometimes is used as a 'mass noun' like 'water' or 'air'. When you say "on the earth", it is similar to saying "on the sea" or "on an island". Earth Day is an annual event on April 22 to demonstrate support for environmental protection. First held on April 22, 1970, it now includes a wide range of events coordinated globally by EARTHDAY.ORG (formerly Earth Day Network) [1] including 1 billion people in more than 193 countries. [2] [1] [3] The official theme for 2023 is Invest In Our ... Facts about the Earth. 1) Earth is the third planet from the sun in our solar system. Its name comes from the the old English and Germanic words meaning ‘the ground’. 2) Our amazing planet has been around for quite some time. By researching our planet’s rocks, scientists have calculated the Earth to be around 4.5 billion years old!Planet Earth's orbit around the sun. While Earth orbits the sun, the planet is simultaneously spinning around an imaginary line called an axis that runs through the core, from the North Pole to ...Apr 22, 2016 · When Earth is a proper noun, the is usually omitted. When you are talking about the ground or soil as a surface or stratum, then you must lowercase the word: The archaeologists excavated the earth at the site. It is acceptable to leave earth lowercase and use the with earth if you are talking about it as the planet we live on: The earth rotates ... Apr 8, 2022 · This process created our solar system's asteroids, comets, planets and moons. Earth's rocky core formed first, with heavy elements colliding and binding together. Dense material sank to the ... 10 Things: Dust in the Wind (on Mars and Well Beyond) Frozen: Ice on Earth and Well Beyond. US-European Satellite Will Make World's First Global Freshwater Survey. nasa.gov. NASA, SpaceX Launch Climate Science Research, More to Space Station. nasa.gov. NASA's ECOSTRESS Sees Las Vegas Streets Turn Up the Heat. nasa.gov. King David, King Solomon, and King Saul all were kings of the earth. Nebuchadnezzar was also a king of the earth. Although he most likely worshiped God the Father, we don't have much evidence. But I do believe he worshipped other Gods while worshiping God the Father, the true God, as the greatest God.Jan 23, 2023 · One is the heat that Earth inherited during its formation 4.5 billion years ago. The Earth was made from the solar nebula , a gigantic gaseous cloud, amid endless collisions and mergings between ... They estimate that Earth formed more than 4.4 billion years ago. Although no one knows when the outer crust of the planet began to form, some scientists believe that the existence of a few grains of zircon dated to about 4.4 billion years ago confirm the presence of stable continents, liquid water, and surface temperatures that were probably ...And both the-- the entire core, both the outer core and the inner core, is mainly nickel and iron. Think about when the earth was forming. What happens is when this whole earth was super hot and was kind of in a fluid state, the heavier elements were allowed to sink down, when everything was fluid.They estimate that Earth formed more than 4.4 billion years ago. Although no one knows when the outer crust of the planet began to form, some scientists believe that the existence of a few grains of zircon dated to about 4.4 billion years ago confirm the presence of stable continents, liquid water, and surface temperatures that were probably ... Starting at the center, Earth is composed of four distinct layers. They are, from deepest to shallowest, the inner core, the outer core, the mantle and the crust. Except for the crust, no one has ever explored these layers in person. In fact, the deepest humans have ever drilled is just over 12 kilometers (7.6 miles).This process created our solar system's asteroids, comets, planets and moons. Earth's rocky core formed first, with heavy elements colliding and binding together. Dense material sank to the ...The meaning of EARTH is the fragmental material composing part of the surface of the globe; especially : cultivable soil. How to use earth in a sentence.5 hours ago · Four asteroids are passing by the Earth this week, and a New Mexico observatory is part of the network watching them go past. On Friday, Asteroids QC5 and GE will go through the solar system at 2. ... Earth science research, climate change, and global warming. The latest news and updates from Phys.org Earth Day is an annual event on April 22 to demonstrate support for environmental protection. First held on April 22, 1970, it now includes a wide range of events coordinated globally by EARTHDAY.ORG (formerly Earth Day Network) [1] including 1 billion people in more than 193 countries. [2] [1] [3] The official theme for 2023 is Invest In Our ... Common Noun. “Earth” and “the earth” are the common noun variations, which are used when we don’t capitalize the word. You should use “the earth” when describing the land on the planet, and you should use “earth” when talking about soil or mud that grows plants. The definition of “the earth,” according to The Cambridge ...Measuring the Circumference of the Earth. More than 2,000 years ago Eratosthenes compared the position of the Sun’s rays in two locations to calculate the spherical size of the Earth with reasonable accuracy. Eratosthenes was born in the Greek colony Cyrene, now the city of Shahhat, Libya. As a young man, he traveled to Athens to pursue his ...When Earth first formed 4.6 billion years ago, a day was about six hours long. Since then, the Earth has slowed down. It takes longer to spin around. Every 100 years, the day gets 0.0017 seconds longer. Why? The moon is slowing down Earth’s rotation with the tides it creates.Apr 8, 2022 · This process created our solar system's asteroids, comets, planets and moons. Earth's rocky core formed first, with heavy elements colliding and binding together. Dense material sank to the ... Dec 15, 2020 · The earth is split into four major layers: the crust, the mantle, the outer core and the inner core. The crust is what humans live on, and it consists of only one percent of the Earth's mass. The centre of the Earth is a solid ball of nickel and iron roughly 70% the size of the moon. Geologists have come a long way in terms of the collective ... They estimate that Earth formed more than 4.4 billion years ago. Although no one knows when the outer crust of the planet began to form, some scientists believe that the existence of a few grains of zircon dated to about 4.4 billion years ago confirm the presence of stable continents, liquid water, and surface temperatures that were probably ...Earth is the only special planet of the Solar system that contains life due to the presence of liquid water in abundance and free atmospheric oxygen. Earth has an oblate spheroidal shape. The mass of Earth is approximately 5.97x10²⁴. Earth revolves around the sun and completes its one round in 365.26 days.Earth's "solid" inner core might actually be a bit mushy, researchers now find. For over half a century, the scientific community thought that Earth 's inner core was a solid ball of compressed ...Mar 25, 2020. Dating the earth in years is tricky. We all know that there are those who believe the earth is billions of years old, and there are those who believe the earth is 6000 years old, or so. Then, there are those who are somewhere in between; and there are those who simply say, "I do not know." Each of these, including the latter ...When Earth is a proper noun, the is usually omitted. When you are talking about the ground or soil as a surface or stratum, then you must lowercase the word: The archaeologists excavated the earth at the site. It is acceptable to leave earth lowercase and use the with earth if you are talking about it as the planet we live on: The earth rotates ...Jan 27, 2023 · The leading flat-earther theory holds that Earth is a disc with the Arctic Circle in the center and Antarctica, a 150-foot-tall (45 meters) wall of ice, around the rim. NASA employees, they say ... The history of Earth is divided into four great eons, starting 4,540 mya with the formation of the planet. Each eon saw the most significant changes in Earth's composition, climate and life. Each eon is subsequently divided into eras, which in turn are divided into periods, which are further divided into epochs . Eon.Earth orbit (yellow) compared to a circle (gray) Earth orbits the Sun at an average distance of 149.60 million km (92.96 million mi) [1] in a counterclockwise direction as viewed from above the Northern Hemisphere. One complete orbit takes 365.256 days (1 sidereal year ), during which time Earth has traveled 940 million km (584 million mi). [2]In the Earth is currently available to stream on Hulu and Kanopy. If you don’t have access to either of those streamers, the film is available to rent from $1.99 and purchase from $9.99 on ...Mar 13, 2023 · Earth is the planet we live on, one of eight planets in our solar system and the only known place in the universe to support life. Earth is the third planet from the sun, after Mercury and Venus, and before Mars. It is about 150 million kilometers (about 93 million miles) from the sun. earth: 1. ( often initial capital letter ) the planet third in order from the sun, having an equatorial diameter of 7926 miles (12,755 km) and a polar diameter of 7900 miles (12,714 km), a mean distance from the sun of 92.9 million miles (149.6 million km), and a period of revolution of 365.26 days, and having one satellite.
Earth is one of the four inner, terrestrial planets in our solar system. Just like the other inner planets —Mercury, Venus, and Mars—it is relatively small and rocky. Early in the history of the solar system, rocky material was the only substance that could exist so close to the Sun and withstand its heat.. Xr 0072
Dec 15, 2022 · The resulting chunks clumped together and formed our Moon. With a radius of 1,080 miles (1,738 kilometers), the Moon is the fifth largest moon in our solar system (after Ganymede, Titan, Callisto, and Io). The Moon is an average of 238,855 miles (384,400 kilometers) away from Earth. That means 30 Earth-sized planets could fit in between Earth ... NASA's website for all news, images and videos related to Earth science. Your planet is changing. We're on it.From the Earth Missouri dispensaries offer curbside pickup and delivery services in select areas, including Downtown, Westside, Brookside, Independence, and Raytown. Other things to note: To guarantee a smooth ride, please ensure exact change on hand, as drivers can only provide up to $5 in change.10 hours ago · A. A scene in Christopher Nolan's Oppenheimer hinges around the worry some Manhattan Project scientists felt that the first atomic bomb test would ignite Earth's atmosphere. Edward Teller, so the ... Earth is made up of complex, interactive systems that create a constantly changing world that we are striving to understand. From the vantage point of space, we are able to observe our planet globally, using sensitive instruments to understand the delicate balance among its oceans, air, land, and life. NASA satellite observations help study and ...One is the heat that Earth inherited during its formation 4.5 billion years ago. The Earth was made from the solar nebula , a gigantic gaseous cloud, amid endless collisions and mergings between ...0.0408% carbon dioxide [28] ~ 1% water vapor ( climate variable) Earth is the third planet from the Sun in the Solar System. It is the only planet known to have life on it. The Earth formed about 4.5 billion years ago. [29] [30] It is one of four rocky planets on the inner side of the Solar System.Mar 25, 2020. Dating the earth in years is tricky. We all know that there are those who believe the earth is billions of years old, and there are those who believe the earth is 6000 years old, or so. Then, there are those who are somewhere in between; and there are those who simply say, "I do not know." Each of these, including the latter ...The Earth's crust is an extremely thin layer of rock that makes up the outermost solid shell of our planet. In relative terms, it's thickness is like that of the skin of an apple. It amounts to less than half of 1 percent of the planet's total mass but plays a vital role in most of Earth's natural cycles.Nov 22, 2018 · Earth is the only planet known to maintain life. Find out the origins of our home planet and some of the key ingredients that help make this blue speck in space a unique global ecosystem ... Earth's circumference (the distance all the way around the equator) is 24,901 miles (40,075 kilometers). Its diameter (the distance from one side to the other through Earth's center) is 7,926 miles (about 12,756 kilometers).Earth's circumference (the distance all the way around the equator) is 24,901 miles (40,075 kilometers). Its diameter (the distance from one side to the other through Earth's center) is 7,926 miles (about 12,756 kilometers). The earth is the Lord’s and everything in it, the world, and all who live in it; For he founded it upon the seas and established it upon the waters, Psalm 24:1-2. The Psalmist confirms God’s ...Oct 27, 2021 · Earth's "solid" inner core might actually be a bit mushy, researchers now find. For over half a century, the scientific community thought that Earth 's inner core was a solid ball of compressed ... The earth is split into four major layers: the crust, the mantle, the outer core and the inner core. The crust is what humans live on, and it consists of only one percent of the Earth's mass. The centre of the Earth is a solid ball of nickel and iron roughly 70% the size of the moon. Geologists have come a long way in terms of the collective ...The days are getting longer. The length of Earth's day is increasing. When Earth was formed 4.6 billion years ago, its day would have been roughly six hours long. By 620 million years ago, this had increased to 21.9 hours. Today, the average day is 24 hours long, but is increasing by about 1.7 milliseconds every century.Nov 22, 2018 · Earth is the only planet known to maintain life. Find out the origins of our home planet and some of the key ingredients that help make this blue speck in space a unique global ecosystem ... The history of Earth is divided into four great eons, starting 4,540 mya with the formation of the planet. Each eon saw the most significant changes in Earth's composition, climate and life. Each eon is subsequently divided into eras, which in turn are divided into periods, which are further divided into epochs . Eon..