| Telescope |
| Telescopes were first developed in Holland about 400 years ago. The first telescopes used lenses to gather light and focus it. |
Astronomy ---------------- |
| Type Largest Refracting (lens) Optical Telescope Largest Reflecting (mirror) Optical/Infrared Telescope Largest Infrared Interferometer Largest Space Telescope Largest Fully Steerable Radio Dish Largest Single Radio Dish Largest Radio Interferometer Largest Millimeter Wavelength Interferometer |
| Lab Yerkes Observatory - Very Large Telescope Interferometer (VLTI) - - Arecibo Observatory Very Long Baseline Array (VLBA) Atacama Large Millimeter Array (ALMA) |
| Location Williams Bay, Wisconsin Mauna Kea, Hawaii - Orbit around Earth West Virginia Puerto Rico - - |
| Name - Keck - Hubble Space Telescope Robert C. Byrd Green Bank Telescope - - - |
| Diameter 1 meter (40 inch) 10 meter (33 feet) 4 8.2 meter (27 feet) 2.4 meter (94 inch) 100 meter by 110 (328 feet by 361) 305 meter (1,000 feet) 10 25 meter (82 feet) 64 12 meter (39 feet) |