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Features a secondary mirror that reflects the light back through a hole in the primary mirror; Advantages: Provides an upright image, greater magnification capabilities, lesser spherical aberration.

Collects radio waves using a large parabolic antenna; Advantages: Can observe the sky day and night, can detect non-visible celestial objects, contributes to the understanding of the universe through different spectrum.

A type of alt-azimuth mounted Newtonian reflector; Advantages: Portable and user-friendly, inexpensive to make, suitable for amateurs and 'sidewalk' astronomy.

Combination of lenses and mirrors that fold the light path; Advantages: Compact size, sealed tube reduces image degradation, versatile for both visual and photographic use.

Employs a spherical mirror and a correcting lens; Advantages: Wide field of view, minimal optical aberrations, well-suited for large-field photographic surveys.

Utilizes a primary mirror to reflect light to a focus; Advantages: Better for larger apertures, no chromatic aberration, easier to maintain.

Characterized by a concave primary mirror and a convex secondary mirror; Advantages: Compact design, focus behind primary mirror allows for better support and ease of use, adaptable for professional astronomy.

Uses lenses to bend light to a focus; Advantages: Simple design, stable image quality, no central obstruction.

Specifically designed to observe the Sun; Advantages: Can filter out large amounts of sunlight for safe observation, specialized for studying solar phenomena, can use adaptive optics to correct for atmospheric effects.