Satellite Sidekick Joins James Webb Telescope in Search for Habitable Planets.

NASA's James Webb Space Telescope will be aided by a smaller satellite called MANTIS, which will look at star activity such as flares and examine the sky in ultraviolet light, including the most energetic set of wavelengths known as extreme ultraviolet. MANTIS aims to provide more data to refine the theory that rocky exoplanets with water on their surface may face extra challenges if they orbit a very active star, given the amount of radiation such planets would be exposed to.