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An exosatellite (or exomoon or extrasolar satellite or moon) is a satellite/moon outside the solar system, e.g., orbiting an extra-solar planet. No exosatellite has been unequivocally identified, though there have been candidates. The proposed detection methods are essentially variations of the methods used to detect exoplanets:
For example, a series of exoplanet transit light curves from the same planet might show occasional additional blocked light that suggests during those transits, a moon was positioned to block a little bit more of the host star's light.