This is a small brass refracting telescope that had been used as a "finder" telescope mounted parallel to the tube of a Springfield Newtonian. The Springfield style of Newtonian reflector was first ...

Ceran is a name brand for a type of glass ceramic that has a very low coefficient of thermal expansion (CTE). This is useful ...

Simply put, a Dobsonian telescope is a type of large aperture Newtonian telescope design popularised by John Dobson back in the mid 1960s, and from whom it takes its name.

The Cassegrain telescope, however, was first experimented with a decade before Newton even thought of using a mirror; its big advantage is that it has a huge f-ratio and so monochromatic ...

1672: Sir Isaac Newton’s reflecting telescope Sketch of Newton’s telescope. Image Source: Library of Congress Washington, D.C. 20540 USA. Digital ID: ...

Save nearly $67 on this computerized Newtonian telescope from Celestron. It features a motorized Go-To mount, and stargazers can use the hand control to navigate to and track approximately 4000 ...

The Andromeda galaxy is also known as Messier 31. It is a spiral galaxy located about 2.5 million light-years from Earth. On ...

Isaac Newton was the first to really make it work. Newton's reflecting telescope consisted of a single curved main mirror, coupled with a smaller flat mirror positioned at the focal point and ...

Newton's design combined a parabolic primary mirror for capturing light with a flat secondary mirror, which directed the image to a viewing port on the side of the telescope barrel.

However, with data from ESA's XMM-Newton and the Japan Space Agency's (JAXA) Suzaku X-ray space telescopes, astronomers have ...

The copy of Isaac Newton's seminal treatise Opticks that he had purchased some 20 years before turned out to be from Newton's own personal library, believed lost for many decades.