Compound, or catadioptric, telescopes combine lenses and mirrors for a compact option, suitable for both planetary and ...

It was the first permanently staffed mountain-top observatory and the 36-inch Great Refractor was the world’s largest refracting telescope and continued to be a premier research telescope for half a ...

During their week on Mt. Hamiliton, the students used three of the observatory’s telescopes—the 40-inch Nickel reflector, the 36-inch Great Refractor, and the Three-meter Shane reflector, Lick’s most ...

However, Galileo's telescopes suffered from high chromatic aberration, which is what happens when a curved lens breaks up light like a prism.

On October 2, 1608, Hans Lippershey demonstrated a new invention – the first optical refracting telescope. A.S.Ganesh turns his telescope to view back in time… nearly 410 years to that day.

Astronomers have constructed telescopes of every kind - massive observatories designed to pick up faint traces of light across space.

The first telescopes, known as refracting telescopes, were built in the early 17th century by Dutch eyeglass makers. They employed a pair of lenses—one convex fitted at the end of the scope, and ...