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7 godz. temu · At that time the Moon orbited the Earth at half its current distance, making it appear 2.8 times larger than it does today. ... (90–168 AD) greatly improved on the numbers of Aristarchus, calculating a mean distance of 59 times Earth's radius and a diameter of 0.292 Earth diameters ... notched bones dating as far back as 20–30,000 years ago ...
7 godz. temu · One astronomical unit (about 150 million kilometres; 93 million miles) is defined as the mean distance between the centres of the Sun and the Earth. The instantaneous distance varies by about ± 2.5 million km or 1.55 million miles as Earth moves from perihelion on ~ January 3rd to aphelion on ~ July 4th.
1 dzień temu · Chicago O'Hare International Airport (IATA: ORD, ICAO: KORD, FAA LID: ORD) is a major international airport serving Chicago, Illinois, United States, located on the city's Northwest Side, approximately 17 miles (27 km) northwest of the Loop business district. Operated by the Chicago Department of Aviation and covering 7,627 acres (3,087 ha), O'Hare has non-stop flights to 214 destinations in ...
1 dzień temu · Enrico Fermi (1901–1954) The Fermi paradox is a conflict between the argument that scale and probability seem to favor intelligent life being common in the universe, and the total lack of evidence of intelligent life having ever arisen anywhere other than on Earth. The first aspect of the Fermi paradox is a function of the scale or the large ...
1 dzień temu · The green sea turtle (Chelonia mydas), also known as the green turtle, black (sea) turtle or Pacific green turtle, is a species of large sea turtle of the family Cheloniidae.It is the only species in the genus Chelonia. Its range extends throughout tropical and subtropical seas around the world, with two distinct populations in the Atlantic and Pacific Oceans, but it is also found in the ...
1 dzień temu · Detroit (/ d ɪ ˈ t r ɔɪ t /, dih-TROYT; locally also / ˈ d iː t r ɔɪ t /, DEE-troyt) is the most populous city in the U.S. state of Michigan.It is the largest U.S. city on the United States–Canada border, and the seat of government of Wayne County.Detroit had a population of 639,111 at the 2020 census, making it the 29th-most populous city in the United States.
1 dzień temu · 25 kV 50 Hz AC overhead line. Operating speed. 360 km/h (225 mph) maximum, 330 km/h (205 mph) routinely [1] High Speed 2 ( HS2) is a high-speed railway which is under construction in England. The route will be between Handsacre, in southern Staffordshire, and London, with a spur to Birmingham. HS2 is to be Britain's second purpose-built high ...
