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  2. James Webb Space Telescope - Wikipedia

    en.wikipedia.org/wiki/James_Webb_Space_Telescope

    [55] [56] The spacecraft bus is on the Sun-facing "warm" side of the sunshield and operates at a temperature of about 300 K (27 °C; 80 °F). [55] The structure of the spacecraft bus has a mass of 350 kg (770 lb), and must support the 6,200 kg (13,700 lb) space telescope. It is made primarily of graphite composite material. [57]

  3. List of largest optical reflecting telescopes - Wikipedia

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

    Multiple mirror telescopes that are on the same mount and can form a single combined image are ranked by their equivalent aperture. Fixed altitude telescopes (e.g. HET) are also ranked by their equivalent aperture. All telescopes with an effective aperture of at least 3.00 metres (118 in) at visible or near-infrared wavelengths are included.

  4. Hubble Space Telescope - Wikipedia

    en.wikipedia.org/wiki/Hubble_Space_Telescope

    The Hubble Space Telescope (HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versatile, renowned as a vital research tool and as a public relations boon for astronomy.

  5. Extremely large telescope - Wikipedia

    en.wikipedia.org/wiki/Extremely_large_telescope

    Comparison of nominal sizes of apertures of the above extremely large telescopes and some notable optical telescopes. An extremely large telescope (ELT) is an astronomical observatory featuring an optical telescope with an aperture for its primary mirror from 20 metres up to 100 metres across, [1] [2] when discussing reflecting telescopes of optical wavelengths including ultraviolet (UV ...

  6. Five-hundred-meter Aperture Spherical Telescope - Wikipedia

    en.wikipedia.org/wiki/Five-hundred-meter...

    A five-kilometre zone near the telescope forbids tourists from using mobile phones and other radio-emitting devices. [41] An expansion has been planned to build additional 24 radio dishes with 40 meters diameter, and forming a radio-telescope array within the surrounding area of 10KM diameter.

  7. 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.

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