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It was originally named the Andromeda Nebula and is cataloged as Messier 31, M31, and NGC 224. Andromeda has a D 25 isophotal diameter of about 46.56 kiloparsecs (152,000 light-years) [8] and is approximately 765 kpc (2.5 million light-years) from Earth. The galaxy's name stems from the area of Earth's sky in which it appears, the constellation ...
A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers.
This bit of marketing obfuscation is calculated as horizontal resolution × vertical resolution × 3. For example: 640 × 480 VGA is 921,600 subpixels, or 307,200 pixels, 800 × 600 SVGA is 1,440,000 subpixels, or 480,000 pixels, and 1024 × 768 XGA is 2,359,296 subpixels, but only 786,432 full-color pixels. ^ Apple Computer 1 megapixel standard.
Betelgeuse is the brightest near-infrared source in the sky with a J band magnitude of −2.99; [ 95 ] only about 13% of the star's radiant energy is emitted as visible light. If human eyes were sensitive to radiation at all wavelengths, Betelgeuse would appear as the brightest star in the night sky.
Boris Grabovsky (1901–1966), Russia – cathode commutator, an early electronic TV pickup tube; Bette Nesmith Graham (1924–1980), U.S. – Correction fluid, Liquid Paper; Iréne Grahn (1945–2013), Sweden – finger joint support for patients with rheumatoid arthritis; Hans Christian Gram (1853–1938), Denmark / Germany – Gram staining ...
On some carbon nanotubes, there is a closed zigzag path that goes around the tube. One says that the tube is of the zigzag type or configuration, or simply is a zigzag nanotube. If the tube is instead encircled by a closed armchair path, it is said to be of the armchair type, or an armchair nanotube. An infinite nanotube that is of one type ...
Timeline for the day of the September 11 attacks. The hijacked United Airlines Flight 175 approaching the South Tower (left) as the North Tower (right) burns next to it. The September 11 attacks of 2001, in addition to being a unique act of terrorism, constituted a media event on a scale not seen since the advent of civilian global satellite links.
Corrective rape, also called curative rape[1] or homophobic rape, [2][3][4] is a hate crime in which somebody is raped because of their perceived sexual orientation. The common intended consequence of the rape, as claimed by the perpetrator, is to turn the person heterosexual. [5][6][7]
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