They use concave mirrors in the telescope to see very far...
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The Newton reflector
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The Optics of Telescopes | Let's Talk Science
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Reflecting telescope - Wikipedia
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Telescope Types
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Which type of telescope can be made using a concave mirror, convex mirror, plane mirror and a lens? Draw diagrams of these telescopes.
Basics of telescope optics and mounting
Telescope Tips: Spherical Mirror vs. Parabolic Mirror. | Spectrum Scientifics' Store Blog
telescope - Reflecting telescopes | Britannica
Two-mirror telescopes: Cassegrain, Gregorian and variants
Microscopes and Telescopes – University Physics Volume 3
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