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The first eon in Earth's history, the Hadean, begins with the Earth's formation and is followed by the Archean eon at 3.8 Ga. [2]: 145 The oldest rocks found on Earth date to about 4.0 Ga, and the oldest detrital zircon crystals in rocks to about 4.4 Ga, [34] [35] [36] soon after the formation of the Earth's crust and the Earth
The Earth is destroyed by the Sun at "high noon", though animals and plants come to an end by 5:00 am, meaning that the time that Earth can remain habitable to animals is very short, lasting only just 1 billion years, with the present day being the halfway point through that relatively short time.
The Gaia hypothesis states that the Earth's atmospheric composition is kept at a dynamically steady state by the presence of life. [27] The atmospheric composition provides the conditions that contemporary life has adapted to. All the atmospheric gases other than noble gases present in the atmosphere are either made by organisms or processed by ...
So to understand how we came to exist on planet Earth, we'll need to know how Earth managed to stay fit for life for billions of years. Earth has been habitable for billions of years ...
The history of life on Earth traces the processes by which living and extinct organisms evolved, from the earliest emergence of life to the present day. Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. [1] [2] [3] The similarities among all known present-day species indicate that they have diverged through the ...
The mass of a potentially habitable exoplanet is between 0.1 and 5.0 Earth masses. [18] However it is possible for a habitable world to have a mass as low as 0.0268 Earth Masses. [58] The radius of a potentially habitable exoplanet would range between 0.5 and 1.5 Earth radii. [18]
Two teams of scientists have discovered a theoretically habitable planet called Gliese 12b that’s smaller than Earth but bigger than Venus, just 40 light-years away.
World War II, with heavy bombardment, genocide, and explosions. Towards the end of the war, nuclear warfare occurs for the first and only time when Hiroshima and Nagasaki are bombed. post-1945: Nuclear tests are performed by the United States, Soviet Union, India, Pakistan, China, North Korea, the United Kingdom, and France.