|Keck Observatory is a joint effort of Caltech and the University of California, consisting of twin 10-meter telescopes, Keck I and Keck II.|
|Caltech's Palomar Observatory, in San Diego County, is home to the venerable Hale 200-inch Telescope, as well as the 60-inch instrument, the 48-inch Samuel Oschin Telescope, and an 18-inch Schmidt camera.|
|The Combined Array for Research in Millimeter-wave Astronomy (CARMA) is currently the world's most powerful telescope at millimeter wavelengths.|
|The Owens Valley Radio Observatory (OVRO), near Bishop, California, is home to a number of Caltech-operated radio telescopes.|
The Chajnantor Test Facility in northern Chile enables experiments in cosmic microwave background observations.
|The Caltech Submillimeter Observatory is one of the world's premier submillimeter telescopes.
The Laser Interferometer Gravitational-Wave Observatory (LIGO) is a pair of four-kilometer-long laser interferometers designed to detect gravitational radiation.
[Image credits: Keck - Rick Peterson; Palomar - Scott Kardel; CARMA - Peter Teuben; OVRO - Oliver King; Chajnantor - CBI Project; CSO - Jacob Kooi; LIGO - LIGO Laboratory]