Astronomy Ch.5 (Light & Telescopes) Crossword
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
 
 
Down: 1) a quantum of electromagnetic energy that carries an amount of energy that depends inversely on its wavelength 2) the ability of a telescope to make an image larger 3) the ability of a telescope to collect light, proportional to the area of the telescope's objective lens or mirror4) electromagnetic radiation with wavelengths shorter than visible light but longer than x-rays 9) a telescope that gathers and focuses visible light10) the distance between successive peaks or troughs of a wave, usually represented by lambda 11) a telescope that forms images by bending (refracting) light with a lens12) the optical design that uses a thin corrector plate at the entrance to the telescope tube. a popular design for small telescopes 14) a telescope lens composed of two lenses ground from different kinds of glass and designed to bring two selected colors to the same focus and correct for chromatic aberration 17) the ability of a telescope to reveal fine detail. depends on the diameter of the telescope objective 22) a distortion found in refracting telescopes because lenses focus different colors at slightly different distances. images are consequently surrounded by color fringes 24) the optical design in which the secondary mirror reflects light back down the tube through a hole in the center of the objective mirror26) a computer-controlled optical system in an astronomical telescope used to partially correct for seeing29) the optical design in which a diagonal mirror reflects light out the side of the telescope tube for easier access31) a unit of energy equivalent to a force of 1 newton acting over a distance of 1m. one joule per second equals 1 watt of power 32) the focal length of a lens is the distance from the lens to the point where it focuses parallel rays of light35) a line in a spectrum at a specific wavelength produced by the absorption or emission of light by certain atoms Across: 1) in a reflecting telescope, the largest mirror3) the illumination of the night sky by waste light from cities and outdoor lighting, which prevents the observation of faint objects 5) atmospheric conditions on a given night. when the atmosphere is unsteady, producing blurred images, the seeing is said to be poor 6) information converted to numerical form for convenient transfer, storage, and analysis 7) a telescope that uses a concave mirror to focus light into an image 8) in a reflecting telescope, a mirror that detects the light from the primary mirror to a focal position 13) an artificial star image produced by a laser pointing up into Earth's atmosphere, used as a reference in adaptive optic systems15) a grid of photosensitive detectors for the purpose of recording images. commercial still and video digital cameras contain CCD array detectors16) the point at which the objective mirror forms an image in a reflecting telescope18) an instrument attached to a telescope for the purpose of precisely measuring the brightness of stars or other objects at one or more wavelengths 19) a representation of graphical data with added or enhanced color to reveal detail 20) a piece of material in which numerous microscopic parallel lines are scribed. light encouraging a grating is dispersed to form a spectrum21) changing electric and magnetic fields that travel through space and transfer energy from one place to another; examples are light or radio waves23) a short-focal length lens used to enlarge the image in a telescope. the lens nearest the eye25) a telescope mounting that allows the telescope to move in altitude (perpendicular to the horizon) and in azimuth (parallel to the horizon)27) a unit of distance equaling one-billionth of a meter (10^-9 m)28) the motor and gears on a telescope that turn it westward to keep it pointed at a star 30) in a refracting telescope, the largest lens33) describes an image in which information invisible to human eyes is represented by visible colors chosen to best convey certain details 34) an arrangement of electromagnetic radiation in order of wavelength or frequency 36) wavelength region in which our atmosphere is transparent -- at visual, infrared, and radio wavelengths 37) an electronic device consisting of a large array of light-sensitive elements used to record very faint images 38) the observing technique in which separated telescopes combine to produce a virtual telescope with the resolution of a much larger-diameter telescope39) a unit of distance commonly used to measure the wavelength of light 1 A = 10^-10m40) electromagnetic radiation with wavelengths intermediate between visible light and radio waves 41) the number of times a given event occurs in a given time; for a wave, the number of cycles that pass the observer in 1 second42) an old-fashioned means of recording astronomical images and photometric information on a photographic emulsion coating a glass plate 43) thin telescope mirrors that are controlled by computers to maintain proper shape as the telescope moves44) blurred fringe surrounding any image, caused by the wave properties of light. because of this, no image detail smaller than the fringe can be seen45) a telescope that gathers and focuses electromagnetic energy with microwave and radio wavelengths 46) a telescope mounting that allows motion parallel to and perpendicular to the celestial equator47) electromagnetic wave with extremely long wavelength, low frequency, and small photon energy
 

 

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