Light travels at different speeds based on the medium it passes through. For example, in a vacuum, it travels at 3.0 × 10^8 m/s in a straight line. But when directed towards glass, air, diamond, water ...

The article reviews the Stellarvue SV4, a 4-inch apochromatic refractor recognized for its high-quality optics and compact form factor. Central to the SV4's design is a LOMO fully multicoated ...

After 400 years, the original telescope design is getting a major upgrade. Part of a DARPA funded project, Lockheed Martin's Segmented Planar Imaging Detector for Electro-optical Reconnaissance ...

The drive was then on to build bigger and more powerful telescopes with greater magnification. It was soon realized that what was to become known as chromatic aberration was a limiting factor in ...

Which refractor telescope is best? Space has intrigued humankind ever since we looked skyward for the first time. While it is difficult to imagine what our ancestors thought of the twinkling lights, ...

This all-inclusive refractor is best for observing planets and the moon, but still able to give skywatchers some glimpses of deep-sky objects.