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

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 ...

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.

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 ...

Christmas is a great time to look for a telescope for your budding amateur astronomer. But there are some things to keep in ...

From magnification to light-gathering, here’s how to make the decision between buying a telescope or a monocular for stargazing and astronomy. Ask an astronomer what the best monocular is for ...