It is one of the largest optical telescopes in the world.

I don't even look through optical telescopes any more; it's not worth the effort.

Since dark matter is invisible, how can an optical telescope see it?

It is the first optical telescope to orbit the Earth.

Currently, a 130-cm optical telescope is installed at the site.

"We should need a good optical telescope, although not necessarily a very large one.

Before leaving, he took a final look at the mysterious sky object through the optical telescope.

Further, his workshop developed the optical telescopes which were a necessary component of the system.

However, as a hobby he developed a strong interest in astronomy and optical telescopes.

Actually it won't give us light images of heavenly bodies such as we see with an optical telescope.

Eventually optical telescopes could also be built this way.

As of 2009, it is the world's largest single-aperture optical telescope.

With a traditional optical telescope, the space between stars and galaxies (the background) is completely dark.

He stared through the optical telescope, his hands deftly working the controls.

Some of them reveal details never before seen in very distant objects, even by the most powerful optical telescopes.

The Destiny spacecraft features an optical telescope with a 1.65m primary mirror.

The telescopic pixel design is based on the optical telescope.

The burst was observed with a 350mm optical telescope and its brightness measured.

Two lenses at this separation form the simplest type of optical telescope.

How could any optical telescope have seen that?

Otherwise the optics are similar to other optical telescopes.

As a result, optical telescopes can perform much closer to their theoretical limit of resolution.

They are named this because they look like planets through small optical telescopes.

It contained a small optical telescope and a package of ultraviolet telescopes.

Starting from 1994, the observatory owns an 80 cm-diameter optical telescope.