Exomoon

Scientists have recently formulated a model to trace elusive exo-moons from James Webb Space Telescope (JWST) data.

So far, five thousand exoplanets — planets orbiting stars other than the Sun, have been discovered by using several ground-based and space telescopes such as Kepler, CoRoT, Spitzer, and Hubble space telescopes.
However, the natural satellites or exomoon around any of these planets still remain untraced.

What is exo-moon?

An exomoon or extrasolar moon is a natural satellite that orbits an exoplanet or other non-stellar extrasolar body.
Though exomoons are difficult to detect and confirm using current techniques,observations from missions such as Kepler have observed a number of candidates, including some that may be habitats for extraterrestrial life and one that may be a rogue planet.