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International X-ray Observatory
Images of Chandra X-ray Observatory and an artist's impression of the 
	Constellation X-ray Observatory

Images of Hubble Space Telescope and Keck Observatory

Constellation-X is modeled after the Keck Observatory, twin optical telescopes each 10 meters (37 feet) wide. Both observatories can collect an enormus amount of light. Keck and Constellation-X are the complements to the great high-angular-resolution space telescopes: Hubbel Space Telescope and Chandra X-ray Observatory, respectively.


Web Curator: Barbara Mattson
NASA Official: Dr. Ann Hornschemeier
Last Updated: May 14, 2008