A 2.4-inch refracting telescope, for example, should never use more than 120-power magnification (the general rule of thumb is 50-power per inch of aperture). In fact, for such a telescope ...

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A 2.4-inch refracting telescope, for example, should never use more than 120-power (the rule of thumb is 50-power per inch of aperture). In fact, for such a telescope, the most rewarding views will ...

Well, any of us who has ever looked through a telescope could say the same, for the two principal types in use today were developed by giants: the refractor by Galileo and the reflector by Newton.

Unistellar eVscope 2 Smart Telescope Features and Benefits: The Unistellar eVscope 2 is a cutting-edge reflector telescope ...

A 40-meter-diameter radio telescope is put into use on Friday in Shigatse ... telescopes will participate in supporting the Tianwen 2 mission next May. He said the bringing online of the two ...