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Telescope Definition–noun | 1. | an optical instrument for making distant objects appear larger and therefore nearer. One of the two principal forms (refracting telescope) consists essentially of an objective lens set into one end of a tube and an adjustable eyepiece or combination of lenses set into the other end of a tube that slides into the first and through which the enlarged object is viewed directly; the other form (reflecting telescope) has a concave mirror that gathers light from the object and focuses it into an adjustable eyepiece or combination of lenses through which the reflection of the object is enlarged and viewed. Compare radio telescope. |
| 2. | (initial capital letter ) Astronomy. the constellation Telescopium. |
–adjective | 3. | consisting of parts that fit and slide one within another. |
–verb (used with object) | 4. | to force together, one into another, or force into something else, in the manner of the sliding tubes of a jointed telescope. |
| 5. | to shorten or condense; compress: to telescope the events of five hundred years into one history lecture. |
–verb (used without object) | 6. | to slide together, or into something else, in the manner of the tubes of a jointed telescope. |
| 7. | to be driven one into another, as railroad cars in a collision. |
| 8. | to be or become shortened or condensed. |
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From Dictionary
Related topics from Britannicatelescope
device used to form magnified images of distant objects.Hale Telescope
one of the world's largest and most powerful reflecting telescopes, located at the Palomar Observatory, Mount Palomar, Calif. Financed by the Rockefeller Foundation, the telescope at Palomar was ...
Schmidt telescope
telescope in which a spherical primary mirror receives light that has passed through a thin aspherical lens, called a correcting plate, that compensates for the image distortions-namely, spherical ...
Keplerian telescope
instrument for viewing distant objects, the basis for the modern refractive telescope, named after the great German astronomer Johannes Kepler. Its eyepiece, or ocular, is a convex (positive, or ...
Galilean telescope
instrument for viewing distant objects, named after the great Italian scientist Galileo Galilei (1564-1642), who first constructed one in 1609. With it, he discovered Jupiter's four largest ...
radio telescope
astronomical instrument consisting of a radio receiver and an antenna system that is used to detect radio-frequency radiation emitted by extraterrestrial sources. Because radio wavelengths are much ...
Hubble Space Telescope
the most sophisticated optical observatory ever placed into orbit around Earth. Earth's atmosphere obscures ground-based astronomers' view of celestial objects by absorbing or distorting light rays ...
Spitzer Space Telescope
U.S. satellite, the fourth and last of the National Aeronautics and Space Administration fleet of "Great Observatories" satellites, designed to study the cosmos at infrared wavelengths. In operation ...
X-ray telescope
instrument designed to detect and resolve X rays from sources outside the Earth's atmosphere. Because of atmospheric absorption, X-ray telescopes must be carried to high altitudes by rockets or ...
telescope
Telescopic systems of this type do not really differ significantly from reflecting telescopes designed to observe in the visible region of the electromagnetic spectrum. The main difference is in the ...
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