Astronomy Chapter 2 Crossword
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
 
 
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Down: 2) image distortion due to the fact that rays hitting a lens/mirror away from the center focus at different lengths than the rays hitting near the center3) clear diameter of the objective lens (in mm)4) the ratio of the apparent size of an object seen through the telescope to its size when seen by the eye alone5) the lowest point of a wave6) optical instrument used to make distant objects appear larger and, therefore, nearer. Uses optical magnification7) mirror with a parabolic/hyperbolic shape, instead of the more conventional spherical shape8) lens that uses a combination of many lenses to achieve the best chromatic correction possible10) lens that focuses light onto the observer's eye11) telescope combining mirrors and at least one lens (also called compound telescope)14) a star emits energy at many wavelengths; the peak wavelength (and therefore the star's color) is related to the star's surface temperature15) highly polished curved-glass mirror in a reflecting telescope16) the arrangement of the colors of visible light according to wavelength 17) piece of glass used to concentrate or disperse light; refracts light19) lens with a complex, non-spherical shape, designed to reduce spherical aberrations21) graph composed of lines joining points of equal intensity22) image distortion due to different colors focusing at different lengths; affects lenses only24) speed = frequency x wavelength speed is in m/s wavelength is in m frequency is in Hz27) light is reflected off of the primary mirror back up the tube to form an image onto this28) false color picture that shows how the radio source in space would "look" to a person with "radio vision"31) the bending of light as it enters a new medium Across: 1) method in which several telescopes combine the signal they receive from the same astronomical object and a single image is constructed by a computer, with a resolution better than that of any single telescope; also called interferometry8) the basic lens type that corrects for chromatic aberration; uses two types of glass whose effects cancel out; short for achromatic doublet9) lens with better correction of chromatic aberration, sharper image, less false color; short for Extra-low Dispersion lens12) the ability of a telescope to collect light; proportional to the collecting surface area, the square of the aperture13) simple two-axis mount for supporting and rotating a telescope on two perpendicular axes, both vertical and horizontal 18) CCD camera20) combines an extremely short-focus spherical primary mirror at the back end of a sealed tube with a thin lens at the front, uses Schmidt corrective plate22) the highest point of a wave23) a small convex mirror used to reflect light back through a hole cut in the primary mirror at the bottom end of the telescope tube25) lens used in a reflector to correct the spherical aberrations of the primary mirror26) a telescope's ability to produce sharp, detailed images under ideal observing conditions; increases with aperture and frequency of light29) optical device used to displace a light ray30) T-shaped primary structure where the lower bar is the right ascension axis and the upper bar is the declination axis32) the change in direction of light as it bounces off a surface33) contains a concave primary mirror, small convex secondary mirror and an eyepiece34) a telescope that uses a single or a combination of curved mirrors that reflect light and form an image35) the distance between the objective and the first image of the object, in mm36) the total energy emitted by a blackbody is proportional to the fourth power of its absolute temperature37) the number of wavelengths that pass by a fixed point in a given time (in Hertz Hz)38) the path that light takes in traversing an optical instrument 39) contains a primary mirror, small diagonal secondary mirror and prime focus40) instrument used to measure a property of light (usually intensity) as a function of wavelength or frequency41) distance from any point on a wave to the next identical point (in meters)42) contains a hyperbolic mirror to correct spherical aberrations and does not need a Schmidt corrective plate43) a rising and falling disturbance that transports energy from a source to a receiver without the actual transfer of material44) like a altitude-azimuth mount but shorter and sturdier
 

 

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