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Since a reflecting telescope does not rely on refraction, it does not produce a halo of different colours around the image.

With a field of view far greater than that of an equivalent reflecting telescope, Dragonfly promises to capture the dim glow of vast, tenuous gas clouds that hold clues to the universe’s unseen dark matter.

A latch to open the top when it stopped moving, and I was ready to attach the plastic tube — and make the longest, and last, reflecting telescope in history.

As a child, he built model airplanes and spent days constructing a reflecting telescope.

He observed the object using a 60-inch reflecting telescope located atop Mt Lemmon in the Santa Catalina mountains outside Tucson, Arizona.