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Operational from 2009 to 2018, it specialized in the hunt for exoplanets using the transit method. It confirmed thousands of exoplanets and provided data on planetary systems' structures.

Launched in 2021, it is the most powerful space telescope ever built. Key features include its infrared capabilities and a 6.5-meter primary mirror. Designed for studying the early universe, the formation of stars, and the detection of exoplanets.

Launched in 2003 and decommissioned in 2020. Key features include its infrared imaging and spectroscopy. It studied the cold and distant universe, including brown dwarfs, exoplanets, and star-forming regions.

Operated from 1991 until its deorbit in 2000. Key features include its sensitivity to gamma-ray emissions, which allowed for the study of pulsars, quasars, and gamma-ray bursts.

Launched in 1999, it observes in the X-ray spectrum. Key features include high-resolution X-ray imaging and spectroscopy, which allow for the study of black holes, quasars, and supernovae. Its era of operation spans from the late 20th into the 21st century.