Terrific Tools for Observing the Skies

________ are used in binoculars to bend the light that comes from the two large lenses and two smaller lenses that you look through.

________ use lenses to collect and focus light.

________- 7 Glass: A trade term for garden- variety borosilicate glass, is often used in cheap binoculars.

________ are excellent for observing variable stars, searching for bright comets and novae, and simply sweeping the sky to take in the scenery.

________: 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.

________ are heavy and difficult to use without a tripod or stand; many people can not use them without one.

________: These are utilized in binoculars that are comparatively straight and narrow; bird watchers prefer these.

________ and Maksutov- Cassegrains use both mirrors and lenses.

________: The brightness of a sky object as seen from a standard distance of 32.6 light- years.

the stars rise in the east and set in the west

The brightness of a sky object as seen from a standard distance of 32.6 light-years

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

The apparent magnitude of the faintest star that you can see

These are utilized in binoculars that are comparatively straight and narrow; bird watchers prefer these

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

A trade term for garden-variety borosilicate glass, is often used in cheap binoculars

It produces images of dim astronomical objects that are brighter and is frequently used in high-end binoculars

Most places in the _____ can see the Milky Way clearly both in winter and summer, high in the sky.

in altitude and azimuth

Best light color for stargazing.

This light diminishes your ability to see faint stars after you become dark-adapted.

These are excellent for observing variable stars, searching for bright comets and novae, and simply sweeping the sky to take in the scenery.

_____ are used in binoculars to bend the light that comes from the two large lenses and two smaller lenses that you look through.

The first number in binoculars.

The second number in binoculars.

________ have smaller fields of view than lower-magnification binoculars, making it more difficult to locate celestial targets.

These binoculars are heavy and difficult to use without a tripod or stand; many people cannot use them without one.

Stars should appear as _____ when in focus and as circular images when out of focus, with smooth transitions between the two.

_____ use lenses to collect and focus light.

_____ use mirrors to collect and focus light.

In a _______, you look through an eyepiece at right angles to the telescope tube.

In this telescope, you look through an eyepiece at the bottom.

These models cost more than reflectors with comparable apertures, but they are smaller and easier to transport on observing expeditions.

With an ______ mount, you can swivel the telescope up and down and side to side — in altitude and azimuth.

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.