An optical instrument designed to make distant objects appear nearer, containing an arrangement of lenses, or of curved mirrors and lenses, by which rays of light are collected and focused and the resulting image magnified
the five steel sections telescope into one another
A telescope incorporating a camera.
A telescope designed to detect sources of X-rays
An instrument used to detect radio emissions from the sky, whether from natural celestial objects or from artificial satellites
An astronomical telescope that operates in space by remote control, to avoid interference by the earth’s atmosphere
A telescope that detects incident electrons or electrons generated by incident light.
A type of catadioptric telescope having a deeply curved meniscus lens and a spheroidal primary mirror. A secondary mirror on the back of the lens brings the light to a focus just behind a hole in the primary mirror
A device for detecting and measuring neutrinos reaching the earth from space.
An astronomical telescope of the earliest type, with a biconvex objective and biconcave eyepiece
A type of catadioptric telescope used solely for wide-angle astronomical photography, with a thin glass plate at the front to correct for spherical aberration. A curved photographic plate is placed at the prime focus inside the telescope
A telescope designed for astronomical use, typically a reflecting or refracting telescope giving an inverted image.
A reflecting telescope in which light reflected from a convex secondary mirror passes through a hole in the primary mirror
An astronomical telescope on an equatorial mount
An early reflecting telescope in which light reflected from a concave elliptical secondary mirror passes through a hole in the primary mirror. It was rendered obsolete by the introduction of Newtonian and Cassegrain telescopes
A reflecting telescope in which the light from the main mirror is deflected by a small flat secondary mirror set at 45°, sending it to a magnifying eyepiece in the side of the telescope
A telescope in which a mirror is used to collect and focus light
A telescope which uses a converging lens to collect the light
A telescope used for observing terrestrial objects, which gives an image that is not inverted
An orbiting astronomical observatory launched in 1990. The telescope’s fine high-resolution images are far better than can be obtained from the earth’s surface
A type of catadioptric telescope, using the correcting plate of a Schmidt telescope together with the secondary mirror and rear focus of a Cassegrain telescope
A telescope on an altazimuth mounting