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The Cal-Tech Submillimeter Observatory (CSO) is located on the summit of Mauna Kea, Hawaii.  This beautiful location allows for better observations since the thin, dry atmosphere contains much less water vapor than other locations around the Earth.  Water vapor is a problem for submillimeter astronomers because light in this band interacts readily with water molecules.

CSO Picture

The Cal-Tech Submillimeter Observatory, Mauna Kea, Hawaii