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Since 1970, magnetic fields have been discovered in well over 200 white dwarfs, ranging from 2 × 10 3 to 10 9 gauss (0.2 T to 100 kT). [113] Many of the presently known magnetic white dwarfs are identified by low-resolution spectroscopy, which is able to reveal the presence of a magnetic field of 1 megagauss or more.
The ratio of width to height for the frame of the televised picture. 4:3 for standard systems, 5:4 for 1K x 1K, and 16:9 for HDTV. ATSC An acronym for "Advanced Televisions System Committee", the organization that defines the standard for high-definition TV in the United States. Attenuation In general terms, a reduction in signal strength. Auto ...
Artificial intelligence (AI), in its broadest sense, is intelligence exhibited by machines, particularly computer systems.It is a field of research in computer science that develops and studies methods and software that enable machines to perceive their environment and use learning and intelligence to take actions that maximize their chances of achieving defined goals. [1]
The service did not meet the 3-hour travel time objective between Boston and New York City. The time was 3 hours and 24 minutes as it partially ran on regular lines, limiting its average speed, with a maximum speed of 240 km/h (150 mph) being reached on a small section of its route through Rhode Island and Massachusetts. [69] [70]
The Milky Way is approximately 890 billion to 1.54 trillion times the mass of the Sun in total (8.9 × 10 11 to 1.54 × 10 12 solar masses), [7] [8] [9] although stars and planets make up only a small part of this. Estimates of the mass of the Milky Way vary, depending upon the method and data used.
The US Census Bureau reported that 28.5 million people (8.8%) did not have health insurance in 2017, [47] down from 49.9 million (16.3%) in 2010. [ 48 ] [ 49 ] Between 2004 and 2013, a trend of high rates of underinsurance and wage stagnation contributed to a healthcare consumption decline for low-income Americans. [ 50 ]
The PLATO system was launched in 1960 at the University of Illinois and subsequently commercially marketed by Control Data Corporation.It offered early forms of social media features with innovations such as Notes, PLATO's message-forum application; TERM-talk, its instant-messaging feature; Talkomatic, perhaps the first online chat room; News Report, a crowdsourced online newspaper, and blog ...
Politically, Europe is divided into about fifty sovereign states, of which Russia is the largest and most populous, spanning 39% of the continent and comprising 15% of its population. Europe had a total population of about 745 million (about 10% of the world population ) in 2021; the third-largest after Asia and Africa.