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Loading contentGround-based facilities that study the sky.
ALMA is an international radio observatory of millimeter and submillimeter antennas located on the Chajnantor plateau in the Atacama Desert of northern Chile.
Arecibo Observatory in Puerto Rico operated a 305-metre radio dish — for decades the largest single-dish radio telescope — until its collapse in 2020.
Cerro Tololo Inter-American Observatory in Chile is a NOIRLab site whose telescopes carried out the Dark Energy Survey.
The next-generation ground-based observatory for very-high-energy gamma rays, an array of imaging atmospheric Cherenkov telescopes being built across two sites — one in the northern hemisphere on La Palma and one in the southern hemisphere in Chile — to catch the faint blue flashes that gamma rays make in the atmosphere. The largest such observatory ever built.
A proposed United States third-generation gravitational-wave observatory with arms up to forty kilometres long — a scaled-up successor to LIGO that, with the Einstein Telescope, would open the distant gravitational-wave universe.
A pair of 8.1-metre optical/infrared telescopes, one in Hawaii and one in Chile, giving coverage of both hemispheres.
A German–British gravitational-wave detector near Hannover with 600-metre arms. Smaller than LIGO or Virgo, it works as a technology testbed — pioneering the squeezed-light and other techniques the larger detectors adopt — and observes as part of the international network.
The world's largest fully steerable radio telescope, a 100-metre dish in Green Bank, West Virginia.
La Silla was ESO's first observatory, a pioneering site on the edge of the Atacama Desert still productive in exoplanet and survey science.
LIGO Hanford in Washington State is one of the two US Laser Interferometer Gravitational-wave Observatory detectors that made the first direct detection of gravitational waves in 2015.
LIGO Livingston in Louisiana is the second US LIGO detector; together with LIGO Hanford it detected the first gravitational waves from merging black holes.
The Mauna Kea Observatories are a collection of independent astronomical research facilities located near the summit of Mauna Kea on the island of Hawaii.
Mount Wilson Observatory in California is where Edwin Hubble discovered the expansion of the universe, using the 100-inch Hooker Telescope.
Palomar Observatory is an astronomical observatory in California, home to the historic 200-inch Hale Telescope.
ESO's Paranal Observatory in the Atacama Desert is home to the Very Large Telescope, one of the most productive ground-based facilities in astronomy.
An optical survey observatory in Chile conducting the wide, fast, deep Legacy Survey of Space and Time.
The Very Large Array is a radio astronomy observatory in New Mexico consisting of 27 movable parabolic antennas arranged in a Y-shaped configuration.
ESO's optical/infrared array of four 8.2-metre telescopes at Cerro Paranal in Chile's Atacama Desert.
Virgo is a European gravitational-wave detector near Pisa, Italy, that observes together with LIGO to localise sources on the sky.