JWST ruled out finding tiny moons around an exoplanet—that's great news

The James Webb Space Telescope (JWST) has opened many wonders of the cosmos to scientists since it began science operations a few years ago. But one thing it hasn't done is find an "exomoon." These still-theoretical moons orbit exoplanets in other star systems, and JWST was supposed to find a plethora of them.

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