Answer:
All large astronomical telescopes are reflectors because reflectors are better suited for observing faint and distant objects in the sky. Reflecting telescopes use mirrors to gather and focus light, which allows them to collect more light and provide higher resolution images than refracting telescopes.
In a reflecting telescope, light enters the telescope and is reflected off a concave mirror at the base of the telescope. This mirror reflects the light back up the telescope to a flat secondary mirror located near the top of the telescope. The secondary mirror reflects the light out of the side of the telescope and into an eyepiece or camera for viewing or recording.
Reflecting telescopes are particularly well-suited for observing faint objects in the sky because they can be built with much larger mirrors than refracting telescopes, which use lenses instead of mirrors. Mirrors can be made much larger and with greater precision than lenses, which allows reflecting telescopes to collect more light and provide higher resolution images of faint and distant objects.
For these reasons, reflecting telescopes are the preferred choice for astronomers who study the universe beyond our solar system, such as galaxies, stars, and other celestial objects.