This list of the largest optical reflecting telescopes with objective diameters of 3.0 metres (120 in) or greater is sorted by aperture, which is a measure of the light-gathering power and resolution of a …

Jan 2, 2026 · Below, we have compiled a list of the twelve largest telescopes in the world. The list includes both operational and planned telescopes, sorted by their effective aperture (light gathering …

Oct 14, 2022 · Some of the largest telescopes are serving as Earth's eyes to explore supernovas, galaxies and other distant objects. Here are the ten biggest telescopes in action and in progress today.

Gran Telescopio Canarias (GTC), the largest optical telescope in the world, with a mirror that has a diameter of 10.4 metres (34.1 feet). It is located at the Roque de los Muchachos Observatory on La …

Mar 4, 2025 · The Gran Telescopio Canarias (GTC) is currently the largest optical and infrared telescope in the world. As its name suggests, this telescope is located in the Canary Islands off the …

Oct 12, 2025 · Discover the Top 10 Biggest Telescopes on Earth 2025 - from FAST in China to Keck in Hawaii. Explore their size, location, and what each telescope studies.

Upon completion, the Giant Magellan Telescope (GMT) will be the largest optical telescope in the world, producing images of the universe with 10 times the clarity of the Hubble Space Telescope.

Oct 19, 2022 · By far, the world’s largest single aperture telescope is the Gran Telescopio Canarias located in Spain. It’s an optical telescope, and its mirror has a diameter of 34.1 feet.

The word "largest" can be a tricky word. So the list is split into traditional single-instrument optical telescopes on a single mount, and into interferometric "virtual" telescopes consisting of multiple …

Sep 17, 2025 · Extremely Large Telescope (ELT) Located in Chile's Atacama Desert, the ELT is currently under construction and is expected to be the largest optical telescope upon completion, …