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  2. Meade ETX telescope - Wikipedia

    en.wikipedia.org/wiki/Meade_ETX_telescope

    The ETX started out as a 90 mm (3-1/2") Maksutov Cassegrain telescope (first produced in 1996) and took advantage of high volume mass production and simplified optical and parts construction to open a new market for a cheap alternative to the very expensive Questar 3-1/2 Maksutov Cassegrain [1] [2] The ETX "line" has been expanded to 105 mm, and 125 mm Maksutov Cassegrains and achromatic ...

  3. Astronomical engineering - Wikipedia

    en.wikipedia.org/wiki/Astronomical_engineering

    Astronomical engineering. Engineering on an astronomical scale, or astronomical engineering, i.e., engineering involving operations with whole astronomical objects (planets, stars, etc.), is a known theme in science fiction, as well as a matter of recent scientific research and exploratory engineering. [1]

  4. Astros II - Wikipedia

    en.wikipedia.org/wiki/Astros_II

    range. 500 Km. Maximum speed. 100 Km/h. Astros II (A rtillery S a T uration RO cket S ystem) is a self-propelled multiple rocket launcher produced in Brazil by the Avibras company. It features modular design and employs rockets with calibers ranging from 127 to 450 mm (5–17.72 inches).

  5. Amateur astronomy - Wikipedia

    en.wikipedia.org/wiki/Amateur_astronomy

    Amateur astronomy is a hobby where participants enjoy observing or imaging celestial objects in the sky using the unaided eye, binoculars, or telescopes. Even though scientific research may not be their primary goal, some amateur astronomers make contributions in doing citizen science, such as by monitoring variable stars, [1] double stars, [2 ...

  6. Astrophotography - Wikipedia

    en.wikipedia.org/wiki/Astrophotography

    An image of Orion's Belt composited from digitized black-and-white photographic plates recorded through red and blue astronomical filters, with a computer synthesized green channel. The plates were taken using the Samuel Oschin Telescope between 1987 and 1991. Astrophotography, also known as astronomical imaging, is the photography or imaging ...

  7. Wrench - Wikipedia

    en.wikipedia.org/wiki/Wrench

    Wrench. A set of metric spanners or wrenches, open at one end and box/ring at the other. These are commonly known as “combination” spanners. A wrench or spanner is a tool used to provide grip and mechanical advantage in applying torque to turn objects—usually rotary fasteners, such as nuts and bolts —or keep them from turning.

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