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The Hale Telescope at Palomar Observatory in California, the largest aperture optical telescope in the world for 28 years, saw first light.
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Hale Telescope
Telescope at Palomar Observatory in California, USA
The Hale Telescope is a 200-inch (5.1 m), f/3.3 reflecting telescope at the Palomar Observatory in San Diego County, California, US, named after astronomer George Ellery Hale. With funding from the Rockefeller Foundation in 1928, he orchestrated the planning, design, and…Source: Wikipedia (CC BY-SA)
Palomar Observatory
Astronomical observatory in Southern California
The Palomar Observatory is an astronomical research observatory in the Palomar Mountains of San Diego County, California, United States. It is owned and operated by the California Institute of Technology (Caltech). Research time at the observatory is granted to Caltech and its…Source: Wikipedia (CC BY-SA)
Aperture
Hole or opening through which light travels
In optics, the aperture of an optical system is the hole or opening that primarily limits light propagated through the system. More specifically, the entrance pupil as the front side image of the aperture and focal length of an optical system determine the cone angle of a bundle…Source: Wikipedia (CC BY-SA)
First light (astronomy)
First use of a telescope
In astronomy, first light is the first practical use of a new instrument, typically a telescope to take an astronomical image after it has been constructed. This is often not the first viewing using the telescope because optical tests have likely been performed to adjust the…Source: Wikipedia (CC BY-SA)