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2 godz. temu · For the purpose of measurement, the Sun's radius is considered to be the distance from its center to the edge of the photosphere, the apparent visible surface of the Sun. By this measure, the Sun is a near-perfect sphere with an oblateness estimated at 9 millionths, which means that its polar diameter differs from its equatorial diameter by ...
1 dzień temu · Enrico Fermi (Los Alamos 1945) The Fermi paradox is the discrepancy between the lack of conclusive evidence of advanced extraterrestrial life and the apparently high likelihood of its existence. As a 2015 article put it, "If life is so easy, someone from somewhere must have come calling by now." Italian-American physicist Enrico Fermi's name is associated with the paradox because of a casual ...
1 dzień temu · The exponential function is defined on the entire domain of the complex numbers.The definition of sine and cosine can be extended to all complex numbers via = = + These can be reversed to give Euler's formula = + = When plotted on the complex plane, the function for real values of traces out the unit circle in the complex plane.. When is a real number, sine and cosine ...
1 dzień temu · Archaic humans emerged out of Africa between 0.5 and 1.8 million years ago. This was followed by the emergence of anatomically modern humans (Homo sapiens) in East Africa around 300,000–250,000 years ago. The earliest known recorded history arose in Ancient Egypt, and later in Nubia, the Horn of Africa, the Maghreb, and the western Sahel. Following the desertification of the Sahara, North ...
1 dzień temu · The term Cattle was borrowed from Anglo-Norman catel, itself from medieval Latin capitale 'principal sum of money, capital', itself derived in turn from Latin caput 'head'. Cattle originally meant movable personal property, especially livestock of any kind, as opposed to real property (the land, which also included wild or small free-roaming animals such as chickens—they were sold as part of ...
1 dzień temu · Etymology. The name "orangutan" (also written orang-utan, orang utan, orangutang, and ourang-outang) is derived from the Malay words orang, meaning "person", and hutan, meaning "forest". The locals originally used the term for actual forest-dwelling humans, but the word underwent a semantic extension to include apes of the Pongo genus at an early stage in the development of Malay.
