Giant ground-based reflector telescopes do much of astronomy's heavy lifting, although the U.S.'s largest in Hawaii is not ...

The journey of astronomical telescopes began in the early 17th century when Galileo Galilei crafted his first refracting ...

Professional Astronomical Refractor Telescope: If you are interested in astronomy or like to explore the night sky, the MEEZAA astronomical telescope is for you. A perfect telescope for adults ...

This was the first working reflecting telescope. Other designers proved unable to grind mirrors with a regular curvature, so the reflector remained largely a curiosity until the mid-18th century ...

Make the most of January's new moon and survey the darkened skies with the best telescopes. Our guide will help you choose the right scope, no matter your budget or experience. Are you new to ...

Refracting telescopes use lenses - combining at least two, and as many as four, pieces of glass - as their objective (the primary light-gathering device). Reflecting telescopes use mirrors to ...

This story appears in the July 2009 issue of National Geographic magazine. When you start stargazing with a telescope, two experiences typically ensue. First, you are astonished by the view ...

THE Yerkes Observatory, which has recently been completed and inaugurated, contains in its instrumental equipment the largest refractor in the world, the diameter of the object-glass spanning 40 ...

Two key inventions enabled astronomers to overcome the problem of chromatic aberration: the invention of the reflecting telescope described by James Gregory and built in a different form by Isaac ...