________ are used in binoculars to bend the light that comes from the two large lenses and two smaller lenses that you look through.
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Refractors
________ use lenses to collect and focus light.
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BK
________- 7 Glass: A trade term for garden- variety borosilicate glass, is often used in cheap binoculars.
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Binoculars
________ are excellent for observing variable stars, searching for bright comets and novae, and simply sweeping the sky to take in the scenery.
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Porro Prisms
________: These are used in relatively wide and short binoculars; they are the best kind for observing the stars because they produce brighter images with the same- sized lenses.
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Giant binoculars
________ are heavy and difficult to use without a tripod or stand; many people can not use them without one.
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Roof Prisms
________: These are utilized in binoculars that are comparatively straight and narrow; bird watchers prefer these.
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Schmidt Cassegrains
________ and Maksutov- Cassegrains use both mirrors and lenses.
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Absolute magnitude
________: The brightness of a sky object as seen from a standard distance of 32.6 light- years.
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If you are observing from the Southern Hemisphere, reverse this procedure and face north
the stars rise in the east and set in the west
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Absolute magnitude
The brightness of a sky object as seen from a standard distance of 32.6 light-years
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Apparent magnitude
This is how bright an object appears from Earth, which is usually different from its absolute magnitude depending on how far away from Earth the sky object is located
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Limiting magnitude
The apparent magnitude of the faintest star that you can see
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Roof Prisms
These are utilized in binoculars that are comparatively straight and narrow; bird watchers prefer these
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Porro Prisms
These are used in relatively wide and short binoculars; they are the best kind for observing the stars because they produce brighter images with the same-sized lenses
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BK-7 Glass
A trade term for garden-variety borosilicate glass, is often used in cheap binoculars
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BaK-4 Glass
It produces images of dim astronomical objects that are brighter and is frequently used in high-end binoculars
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Northern Hemisphere
Most places in the _____ can see the Milky Way clearly both in winter and summer, high in the sky.
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With an alt-azimuth mount, you can swivel the telescope up and down and side to side
in altitude and azimuth
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Red Light
Best light color for stargazing.
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White Light
This light diminishes your ability to see faint stars after you become dark-adapted.
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Binoculars
These are excellent for observing variable stars, searching for bright comets and novae, and simply sweeping the sky to take in the scenery.
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Prisms
_____ are used in binoculars to bend the light that comes from the two large lenses and two smaller lenses that you look through.
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Optical Magnification
The first number in binoculars.
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Aperture / Diameter
The second number in binoculars.
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Higher-magnification binoculars
________ have smaller fields of view than lower-magnification binoculars, making it more difficult to locate celestial targets.
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Giant Binoculars
These binoculars are heavy and difficult to use without a tripod or stand; many people cannot use them without one.
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sharp points
Stars should appear as _____ when in focus and as circular images when out of focus, with smooth transitions between the two.
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Refractors
_____ use lenses to collect and focus light.
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Reflectors
_____ use mirrors to collect and focus light.
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Newtonian reflector
In a _______, you look through an eyepiece at right angles to the telescope tube.
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Cassegrain telescope
In this telescope, you look through an eyepiece at the bottom.
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Schmidt-Cassegrains and Maksutov-Cassegrains
These models cost more than reflectors with comparable apertures, but they are smaller and easier to transport on observing expeditions.
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alt-azimuth
With an ______ mount, you can swivel the telescope up and down and side to side — in altitude and azimuth.
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equatorial
With the more expensive _____ mount, you align one axis of the telescope to point directly at the Celestial North Pole or, for Southern Hemisphere viewers, the Celestial South Pole.
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