page_title: Great Observatories program
hierarchical_section_title: Great Observatories program
caption_attribution_description: English: NASA's series of Great Observatories satellites are four large, powerful space-based telescopes.
context_page_description: NASA's series of Great Observatories satellites are four large, powerful space-based astronomical telescopes launched between 1990 and 2003. They were built with different technology to examine specific wavelength/energy regions of the electromagnetic spectrum: gamma rays, X-rays, visible and ultraviolet light, and infrared light. Two remain operational as of 2020.
context_section_description: NASA's series of Great Observatories satellites are four large, powerful space-based astronomical telescopes launched between 1990 and 2003. They were built with different technology to examine specific wavelength/energy regions of the electromagnetic spectrum: gamma rays, X-rays, visible and ultraviolet light, and infrared light. Two remain operational as of 2020.
caption: Four Great Observatories
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