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Telescopes are designed to work like the human eye, but with the capacity to collect much more light than a human eye can collect.  This is why the “size” of a telescope is so important. The size refers to the telescope’s aperture, or diameter. Think of a telescope as a light collecting bucket.   The diameter determines how much light can enter. The more light that can enter, the brighter the image. I am fond of referring to my telescope as my light bucket!

Rhiannon's 10
10" Reflecting Telescope on Dobsonian Mount

The 2 basic types of optical telescopes are REFRACTING TELESCOPES and REFLECTING TELESCOPES:

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