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Year built: 1987; Significant contributions: The largest single-dish submillimetre telescope in the world used for studying the Solar System, interstellar dust, and distant galaxies.

Year built: 1990; Significant contributions: Expanding our understanding of the universe, determining the rate of expansion of the universe, and capturing detailed images of distant galaxies and phenomena.

Year built: 1980; Significant contributions: Highly versatile radio astronomy observatory with major roles in high resolution imaging and studies of radio galaxies, quasars, and cosmic microwave background radiation.

Year built: 1888; Significant contributions: Host to some of the earliest discoveries of moons around Jupiter, as well as observational spectroscopy that has advanced the understanding of stars and galaxies.

Year built: 1963; Significant contributions: This radio telescope was critical for advances in SETI (Search for Extraterrestrial Intelligence), astronomical radar observations of planets, and atmospheric science.

Year built: 1957; Significant contributions: The Green Bank Telescope (GBT) is the world's largest fully steerable radio telescope, contributing to the discovery of complex molecules in space and probing the distant universe.

Year built: 1993; Significant contributions: The twin Keck telescopes boast the most scientifically productive optical and infrared telescopes, enabling detailed studies of galaxies, exoplanets, and the intergalactic medium.

Year built: 1904; Significant contributions: Home to the 100-inch Hooker telescope which played a key role in astronomical discoveries of the 20th century, including the expanding universe.

Year built: 1948; Significant contributions: Its 200-inch Hale telescope was the world's largest effective telescope for 45 years and has contributed greatly to astronomical spectroscopy and photometry.