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Vor einem Tag · Mercury's core has a higher iron content than that of any other planet in the Solar System, and several theories have been proposed to explain this. The most widely accepted theory is that Mercury originally had a metal–silicate ratio similar to common chondrite meteorites, thought to be typical of the Solar System's rocky matter, and a mass approximately 2.25 times its current mass. [41]
- 47.36 km/s
- 58.646 d, 1407.5 h
- 10.892 km/h (3.026 m/s)
- trace (≲ 0.5 nPa)
Vor 5 Stunden · Etymology The English word sun developed from Old English sunne. Cognates appear in other Germanic languages, including West Frisian sinne, Dutch zon, Low German Sünn, Standard German Sonne, Bavarian Sunna, Old Norse sunna, and Gothic sunnō. All these words stem from Proto-Germanic * sunnōn. This is ultimately related to the word for sun in other branches of the Indo-European language ...
Vor 5 Stunden · If photons were not purely massless, their speeds would vary with frequency, with lower-energy (redder) photons moving slightly slower than higher-energy photons. Relativity would be unaffected by this; the so-called speed of light, c , would then not be the actual speed at which light moves, but a constant of nature which is the upper bound on speed that any object could theoretically attain ...
Vor 5 Stunden · Heraclitus ( / ˌhɛrəˈklaɪtəs /; Greek: Ἡράκλειτος Herákleitos; fl. c. 500 BC) was an ancient Greek pre-Socratic philosopher from the city of Ephesus, which was then part of the Persian Empire. He exerts a wide influence on Western philosophy, including the works of Plato and Aristotle. Little is known of Heraclitus's life.
Vor 5 Stunden · v. t. e. The cosmic microwave background ( CMB or CMBR) is microwave radiation that fills all space in the observable universe. It is a remnant that provides an important source of data on the primordial universe. [1] With a standard optical telescope, the background space between stars and galaxies is almost completely dark.
Vor 5 Stunden · With high-lift devices on its wing, the 727 could use shorter runways than most earlier jets (e.g. the 4800-ft runway at Key West International Airport). Later 727 models were stretched to carry more passengers [15] and replaced earlier jet airliners such as the Boeing 707 and Douglas DC-8 , as well as aging propeller airliners such as the DC-4 , DC-6 , DC-7 , and the Lockheed Constellations ...
Vor einem Tag · Although it has abundant natural resources, Africa remains the world's poorest and least-developed continent (other than Antarctica), the result of a variety of causes that may include corrupt governments that have often committed serious human rights violations, failed central planning, high levels of illiteracy, low self-esteem, lack of access to foreign capital, legacies of colonialism, the ...
