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Hace 23 horas · History of Europe. The history of Europe is traditionally divided into four time periods: prehistoric Europe (prior to about 800 BC), classical antiquity (800 BC to AD 500), the Middle Ages (AD 500–1500), and the modern era (since AD 1500). The first early European modern humans appear in the fossil record about 48,000 years ago, during the ...
Hace 23 horas · Modern physics began in the early 20th century with the work of Max Planck in quantum theory and Albert Einstein's theory of relativity. Both of these theories came about due to inaccuracies in classical mechanics in certain situations.
Hace 23 horas · Roman numerals on stern of the ship Cutty Sark showing draught in feet. The numbers range from 13 to 22, from bottom to top. Part of a series on Numeral systems Place-value notation Hindu–Arabic numerals Western Arabic Eastern Arabic Bengali Devanagari Gujarati Gurmukhi Odia Sinhala Tamil Malayalam Telugu Kannada Dzongkha Tibetan Balinese Burmese Javanese Khmer Lao Mongolian Sundanese Thai ...
Hace 23 horas · In modern terms, this corresponds to early B-type stars Secchi class II: Yellow stars – hydrogen less strong, but evident metallic lines, such as the Sun, Arcturus, and Capella. This includes the modern classes G and K as well as late class F. Secchi class III: Orange to red stars with complex band spectra, such as Betelgeuse and Antares.
Hace 23 horas · The 1990s (often referred to as the "' 90s " or " Nineties ") was a decade that began on January 1, 1990, and ended on December 31, 1999. Known as the "post-Cold War decade", the 1990s are culturally imagined as the period from the Revolutions of 1989 until the September 11 attacks in 2001. [1] The dissolution of the Soviet Union marked the end ...
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