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History of Earth - Wikipedia
Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula. [4][5][6] Volcanic outgassing probably created the primordial atmosphere and then the ocean, but the early atmosphere contained almost no oxygen. See more
The natural history of Earth concerns the development of planet Earth from its formation to the present day. Nearly all branches of natural science have contributed to understanding of the main events of Earth's … See more
The standard model for the formation of the Solar System (including Earth) is the solar nebula hypothesis. In this model, the Solar System formed from a large, rotating cloud of interstellar … See more
In geochronology, time is generally measured in mya (million years ago), each unit representing the period of approximately 1,000,000 years in the past. The history of Earth … See more
The history of Earth can be organized chronologically according to the geologic time scale, which is split into intervals based on stratigraphic analysis.
The following five … See moreThe Phanerozoic is the current eon on Earth, which started approximately 538.8 million years ago. It consists of three eras: The See more
Wikipedia text under CC-BY-SA license Anthropologists Find 4.5 Million-year-old Hominid ... - ScienceDaily
Jan 21, 2005 · Scientists from Indiana University Bloomington and seven other institutions have unearthed skeletal fossils of a human ancestor believed to have lived about 4.5 million years ago.
Meet the human ancestor who walked Earth 4 million years ago
With a hairy body and snout-like face, Ardi must have looked more ape than human when she roamed her woodland habitat in East Africa some 4.4 million years ago – except for her …
The History of Earth in Five Epic Chapters | NOVA - PBS
- Birth of the Sky. Early Earth was a hellscape of molten lava and barren rock, bombarded by …
- Frozen Planet. 700 million years ago, Earth was a giant snowball cloaked in ice from pole to …
- Life Rising. For billions of years, life teemed in Earth’s oceans while the land was desolate …
- Inferno. 252 million years ago, a devastating mass extinction wiped out about 90% of all …
- Humans. How did Earth give rise to humans? With stunningly realistic animation, witness …
The Most Detailed Earth Timeline: History, Facts & Origin
Oct 17, 2024 · Earth formed about 4.5 billion years ago from the solar nebula. The origin of the Earth is a giant rotating cloud of gas and dust left over from the Sun's formation. As gravity …
Human Evolution: A Timeline of Early Hominids …
Since about 4 million years ago, humans have evolved from early hominids to modern humans. Here are 14 species examples from human evolution now extinct. Apes remained in trees as their primary food source.
Anthropologists find 4.5 million-year-old hominid fossils in ... - IU
Jan 17, 2005 · IU Bloomington paleoanthropologist Sileshi Semaw holds the fossil of a hominid mandible (lower jaw bone) believed to be about 4.5 million years old. The fossils were …
Becoming Human: The Evolution of Walking Upright
Aug 6, 2012 · The earliest hominid with the most extensive evidence for bipedalism is the 4.4-million-year-old Ardipithecus ramidus.
Ethiopian fossils show our ancestors stepped out 4.5m years ago
Jan 21, 2005 · Fossil hunters in Ethiopia have discovered the remains of at least nine primitive hominids, nearly 4.5 million years old, which scientists claim could help fill some of the gaps in …
Oldest hominid skeleton revealed - Nature
Oct 1, 2009 · At 4.4 million years, Ethiopian fossil clarifies human–chimp relationships. In a far-reaching reordering of human evolution, researchers report today the discovery of the oldest …
Prehistoric Times [ushistory.org]
It was at the beginning of the Old Stone Age, approximately 4.4 million years ago, that the first human ancestors made their appearance on earth. Approximately 3.5 million years ago, …
Earth Timeline: From 4.5 Billion Years Ago To Today
Over 4.5 billion years ago, our solar system formed from a giant molecular cloud that collapsed under its own tremendous gravity. The hot stew of hydrogen and helium gave birth to our sun …
How Old Is Earth and How Did Scientists Figure It Out?
If you look up the age of Earth on science websites and in publications, you'll generally find an estimate of 4.54 billion years, plus or minus 50 million years.
Timeline of the evolution of life on Earth - New Scientist
Jul 14, 2009 · 47 million years ago The famous fossilised primate known as “ Ida ” lives in northern Europe. Early whales called protocetids live in shallow seas , returning to land to give …
Geologic history of Earth - Pregeologic Period, Formation, Eons ...
From the point at which the planet first began to form, the history of Earth spans approximately 4.6 billion years. The oldest known rocks—the faux amphibolites of the Nuvvuagittuq greenstone …
How Science Figured Out the Age of Earth - Scientific American
Oct 20, 2013 · The resulting knowledge has led to the current understanding that the earth is 4.55 billion years old. That takes us to the end of this series of papers but not to the end of the story.
Evolution of Earth - Scientific American
Jul 1, 2005 · Such constant change has characterized Earth since its beginning some 4.5 billion years ago. From the outset, heat and gravity shaped the evolution of the planet. These forces …
Impact that formed the Moon struck a practically newborn Earth
Mar 14, 2025 · Dated to about 4.35 billion years ago, some 200 million years after the Solar System began, they prompted estimates that the Moon itself formed then. Yet such a “young” …
Geologic Timeline - U.S. National Park Service
Aug 16, 2022 · Earth is over 4.5 billion years old and life has existed on its surface for only a fraction of that time, but it has still grown an unfathomable diversity. United States Geological …
The Seven-Ages of Earth as Seen Through the Continental Lens
Feb 24, 2023 · Fragments of the continental crust extend back 4 billion years, and mineral fragments are as old as 4.4 billion years, reaching within 150 million years of the formation of …
A map that fills a 500-million year gap in Earth's history - Phys.org
Jun 27, 2017 · Earth is estimated to be around 4.5 billion years old, with life first appearing around 3 billion years ago. To unravel this incredible history, scientists use a range of different...
Earth's oldest-known impact crater discovered in outback WA
Mar 6, 2025 · Our planet was mostly a water world during the Archaean eon, a time period covering about 4 billion to 2.5 billion years ago. But so much change has happened since …
How Old Is the Sun? | NASA Space Place – NASA Science for Kids
May 25, 2021 · It still has about 5,000,000,000—five billion—years to go. When those five billion years are up, the Sun will become a red giant. That means the Sun will get bigger and cooler …
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