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Hace 23 horas · In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the rainbow of colors interspersed with spectral lines. Each line indicates a particular chemical element ...
Hace 23 horas · Wernher Magnus Maximilian Freiherr von Braun ( US: / ˌvɜːrnər vɒn ˈbraʊn / VUR-nər von BROWN, German: [ˌvɛʁnheːɐ̯ fɔn ˈbʁaʊ̯n]; 23 March 1912 – 16 June 1977) was a German-American aerospace engineer [3] and space architect. He was a member of the Nazi Party and Allgemeine SS, the leading figure in the development of rocket ...
Hace 23 horas · Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting. [1] [2] In a descriptive sense, the term light pollution refers to the effects of any poorly implemented lighting sources, during the day or night. Light pollution can be understood not only as a phenomenon resulting from a specific source or kind ...
Hace 23 horas · Language. English. Budget. $18.5 million. Box office. $131.1–183.3 million. Aliens is a 1986 science fiction action film written and directed by James Cameron. It is the sequel to the 1979 science fiction horror film Alien, and the second film in the Alien franchise. Set in the far future, it stars Sigourney Weaver as Ellen Ripley, the sole ...
Hace 23 horas · The Strategic Defense Initiative ( SDI ), derisively nicknamed the Star Wars program, was a proposed missile defense system intended to protect the United States from attack by ballistic nuclear missiles. The concept was announced in 1983, by President Ronald Reagan, [1] a critic of the doctrine of mutual assured destruction (MAD), which he ...
Hace 23 horas · The Super Nintendo Entertainment System, commonly shortened to Super Nintendo, [b] Super NES or SNES, [c] is a 16-bit home video game console developed by Nintendo that was released in 1990 in Japan and South Korea, [16] 1991 in North America, 1992 in Europe and Oceania and 1993 in South America. In Japan, it is called the Super Famicom ( SFC ...
Hace 23 horas · Ammonia was first detected in interstellar space in 1968, based on microwave emissions from the direction of the galactic core. This was the first polyatomic molecule to be so detected. The sensitivity of the molecule to a broad range of excitations and the ease with which it can be observed in a number of regions has made ammonia one of the most important molecules for studies of molecular ...
