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Earth science. The rocky side of a mountain creek in Costa Rica. Earth science or geoscience includes all fields of natural science related to the planet Earth. [1] This is a branch of science dealing with the physical, chemical, and biological complex constitutions and synergistic linkages of Earth's four spheres: the biosphere, hydrosphere ...
10 million – 100 million years 4.5–4.6 bya: Terrestrial planets and the Moon form. Giant impacts occur. Water delivered to Earth. [2] Main sequence 50 million years 4.5 bya: Sun becomes a main-sequence star. [32] 200 million years 4.4 bya: Oldest known rocks on the Earth formed. [140] [142] 500 million – 600 million years 4.0–4.1 bya
The angle of the Earth's axial tilt with respect to the orbital plane (the obliquity of the ecliptic) varies between 22.1° and 24.5°, over a cycle of about 41,000 years. The current tilt is 23.44°, roughly halfway between its extreme values.
368. The Zoologist's Guide to the Galaxy. What Animals on Earth Reveal about Aliens – and Ourselves is a 2020 popular science book by the Cambridge University zoologist Arik Kershenbaum. It discusses the possible nature of life on other planets, based on the study of animal life on Earth. The book argues that the evolutionary processes that ...
Earth system science (ESS) is the application of systems science to the Earth. [1][2][3][4] In particular, it considers interactions and 'feedbacks', through material and energy fluxes, between the Earth's sub-systems' cycles, processes and "spheres"— atmosphere, hydrosphere, cryosphere, [5] geosphere, pedosphere, lithosphere, biosphere, [6 ...
Erich Anton Paul von Däniken (/ ˈ ɛr ɪ k f ɒ n ˈ d ɛ n ɪ k ɪ n /; German: [ˈeːrɪç fɔn ˈdɛːnɪkən]; born 14 April 1935) is a Swiss author of several pseudoscientific books which make claims about extraterrestrial influences on early human culture, including the best-selling Chariots of the Gods?, published in 1968.
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 itself.
There can be only one center of the universe, and as a result there are no other inhabited worlds within it besides Earth. As such the Earth is unique and alone in this regard. Aristotle theorized that beyond the sublunary sphere and the heavens is an external spiritual space that mankind cannot fathom directly. [2]
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