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A 22-inch Newtonian reflector sits in front of the clubhouse at Stellafane, home of the Springfield Telescope Makers
A 22-inch Newtonian reflector sits in front of the clubhouse at Stellafane, home of the Springfield Telescope Makers
A 6-inch (15 cm) Newtonian reflector built by a school student on display at Stellafane
A 6-inch (15 cm) Newtonian reflector built by a school student on display at Stellafane
Grinding a mirror using an abrasive and a smaller tool over 300 mm mirror ("ATM Korenica 2006", in Korenica, Croatia)
Grinding a mirror using an abrasive and a smaller tool over 300 mm mirror ("ATM Korenica 2006", in Korenica, Croatia)
Parabolic mirror showing Foucault shadow patterns made by knife edge inside radius of curvature R (red X), at R and outside R.
Parabolic mirror showing Foucault shadow patterns made by knife edge inside radius of curvature R (red X), at R and outside R.
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The 100-inch (2.54 m) Hooker reflecting telescope at Mount Wilson Observatory near Los Angeles, USA, used by Edwin Hubble to measure galaxy redshifts
The 100-inch (2.54 m) Hooker reflecting telescope at Mount Wilson Observatory near Los Angeles, USA, used by Edwin Hubble to measure galaxy redshifts and discover the general expansion of the universe.
17th- century telescope
17th- century telescope
Three radio telescopes belonging to the Atacama Large Millimeter Array
Three radio telescopes belonging to the Atacama Large Millimeter Array
Hitomi telescope's X-ray focusing mirror, consisting of over two hundred concentric aluminium shells
Hitomi telescope's X-ray focusing mirror, consisting of over two hundred concentric aluminium shells