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Great Observatories program

From Simple English Wikipedia, the free encyclopedia

FourGreat Observatories

TheGreat Observatories program is four large, powerful space-basedtelescopes. They are a series ofsatellites placed byNASA. EachSpace observatory has been important toastronomy.

TheHubble Space Telescope (HST) looks atvisible light andnear-ultraviolet. It was launched in 1990. In 1997 ability to look at thenear-infrared range was added. In 2009 there was a mission to service Hubble.

TheCompton Gamma Ray Observatory (CGRO) looks atgamma rays. It also looks at somehard x-rays as well. It was launched in 1991. It was deorbited in 2000.

TheChandra X-ray Observatory (CXO) looks atsoft x-rays. It was launched in 1999.

TheSpitzer Space Telescope (SST) looks at theinfrared spectrum. It was launched in 2003.

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