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Launch Date: June 11th, 2008

Type of light it collects: Gamma Rays

WHY it collects this light: To look at black holes and try to understand them better than can be seen with the human eye.

Important Discoveries: It explored in depth how the universe behaves in gamma radiation.

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Launch Date: August 25th, 2003

Type of light it collects: Infrared

WHY it collects this light: To look at heat signatures from the Sun, as well as looking at the early universe.

Important Discoveries: Studying planets outside of our solar system.

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Launch Date: April 24th, 1990

Type of light it collects: Ultraviolet and Gamma Radiation

WHY it collects this light: To figure out how galaxies and black holes work.

Important Discoveries: It discovered seasons of other planets as well as Pluto's moons.

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Launch Date: June 7th, 1992

Type of light it collects: Ultraviolet

WHY it collects this light: To conduct in-depth searches of the sky.

Important Discoveries: It made the first extreme ultraviolet scan of the sky.

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Launch Date: July 23rd, 1999

Type of light it collects: X-Rays

WHY it collects this light: to look at clusters of galaxies, supernovas, and matter around black holes

Important Discoveries: found the Crab Nebula and saw entire formations that other telescopes could only partially see.

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Launch Date: This telescope will be launched from French Guiana in 2019.

Type of light it collects: Infrared

WHY it collects this light: To study the sky in ways that the human eye cannot.

Important Discoveries: It is expected to find out when space objects were formed by tracing their infrared heat signatures.