====== Visible-light telescopes ======

^ Telescope Name ^ Location ^ Frequency Range ^ Number of Antennas ^ Key Scientific Objectives ^ Notable Features ^
| **Hubble Space Telescope (HST)** | Space (Low Earth Orbit) | 2.4m | Space telescope (reflector) | Galaxy formation, planetary atmospheres, star clusters | Ultra-clear, high-resolution images from above the atmosphere, extensive optical and UV capabilities |
| **Keck Observatory** | Mauna Kea, Hawaii, USA | 10m (two telescopes) | Ground-based, optical and IR | Exoplanets, distant galaxies, black holes | Uses adaptive optics; very large primary mirror for detailed imaging |
| **Very Large Telescope (VLT)** | Paranal Observatory, Chile | 8.2m (four telescopes) | Ground-based, optical and IR | Star formation, galaxy evolution, exoplanets | Adaptive optics, can operate in interferometric mode for high angular resolution |
| **Gran Telescopio Canarias (GTC)** | La Palma, Canary Islands, Spain | 10.4m | Ground-based, optical and IR | Star formation, black holes, galaxy evolution | Largest single-aperture optical telescope, high sensitivity for faint objects |
| **Subaru Telescope** | Mauna Kea, Hawaii, USA | 8.2m | Ground-based, optical and IR | Galaxy evolution, star clusters, solar system objects | Wide-field imaging capabilities, adaptive optics for high-resolution imaging |
| **Gemini Observatory** | Mauna Kea, Hawaii & Cerro Pachón, Chile | 8.1m | Ground-based, optical and IR (twin telescopes) | Exoplanet studies, stellar populations, distant galaxies | Dual locations for full-sky coverage, adaptive optics for precision imaging |
| **Large Binocular Telescope (LBT)** | Mount Graham, Arizona, USA | 2 x 8.4m mirrors | Ground-based, optical and IR | Exoplanets, galaxy formation, stellar populations | Dual 8.4m mirrors provide high sensitivity and resolution; interferometric capability |
| **Lowell Discovery Telescope (LDT)** | Happy Jack, Arizona, USA | 4.3m | Ground-based, optical and IR | Exoplanets, Kuiper Belt objects, near-Earth objects | Versatile optical and near-infrared capabilities; focuses on planetary and stellar studies |
| **Canada-France-Hawaii Telescope (CFHT)** | Mauna Kea, Hawaii, USA | 3.6m | Ground-based, optical and IR | Galaxy clusters, dark matter, exoplanets | Strong in wide-field imaging; notable for deep field surveys |
| **Pan-STARRS (Panoramic Survey Telescope and Rapid Response System)** | Haleakala, Hawaii, USA | 1.8m | Ground-based, wide-field survey | Near-Earth asteroids, supernovae, transient events | Equipped for rapid, all-sky surveys; focuses on detecting moving and variable objects |