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  2. List of largest optical refracting telescopes - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_optical...

    The Swedish 1-m Solar Telescope, with a lens diameter of 43 inches, is technically the largest, with 39 inches clear for the aperture.The second largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for over a century.

  3. 4K resolution - Wikipedia

    en.wikipedia.org/wiki/4K_resolution

    3840 × 1600 (2.40:1 or 12:5); a number of computer monitors with this resolution have been produced, the first being the 37.5-inch (95 cm) LG 38UC99-W released in 2016. This resolution is equivalent to WQXGA (2560 × 1600) extended in width by 50%, or 3840 × 2160 reduced in height by ≈26%. [ 141 ]

  4. Milky Way - Wikipedia

    en.wikipedia.org/wiki/Milky_Way

    −0.07 GeV cm −3) [20] The Milky Way [ c ] is the galaxy that includes the Solar System , with the name describing the galaxy's appearance from Earth : a hazy band of light seen in the night sky formed from stars in other arms of the galaxy, which are so far away that they cannot be individually distinguished by the naked eye .

  5. Liquid-crystal display - Wikipedia

    en.wikipedia.org/wiki/Liquid-crystal_display

    That's three for red, green and blue and 1920 columns of pixels for each color for a total of 5760 wires going vertically and 1080 rows of wires going horizontally. For a panel that is 28.8 inches (73 centimeters) wide, that means a wire density of 200 wires per inch along the horizontal edge.

  6. 7 mm caliber - Wikipedia

    en.wikipedia.org/wiki/7_mm_caliber

    Name Bullet Case length Rim Base Shoulder Neck OAL .270 British: 7.04 mm (0.277 in) 46 mm (1.8 in) 11.3 mm (0.44 in) 11.3 mm (0.44 in) - - 62.3 (2.45)

  7. Wafer (electronics) - Wikipedia

    en.wikipedia.org/wiki/Wafer_(electronics)

    Wafer size Typical thickness Year introduced [13] Weight per wafer 100 mm2 (10 mm) Die per wafer 1-inch (25 mm) 1960 2-inch (51 mm) 275 μm: 1969 9 3-inch (76 mm) 375 μm 1972 29 4-inch (100 mm) 525 μm 1976 10 grams [18] 56 4.9 inch (125 mm) 625 μm 1981 95 150 mm (5.9 inch, usually referred to as "6 inch") 675 μm 1983 144

  8. Penny (United States coin) - Wikipedia

    en.wikipedia.org/wiki/Penny_(United_States_coin)

    Four different reverse designs in 2009 honored Lincoln's 200th birthday and a new, "permanent" reverse – the Union Shield – was introduced in 2010. The coin is 0.75 inches (19.05 mm) in diameter and 0.0598 inches (1.52 mm) in thickness. The current copper-plated zinc cent issued since 1982 weighs 2.5 grams, while the previous 95% copper ...

  9. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    Flashing SMD LEDs in the 0805 and other size formats have been available since early 2019. Flickering Infrared light from the LED die of IR LED as seen by a digital camera Simple electronic circuits integrated into the LED package have been around since at least 2011 which produce a random LED intensity pattern reminiscent of a flickering ...