Astronomers pointed JWST at a planet near the star Epsilon Indi — a giant gas ball resembling Jupiter, just 12 light-years away. In thermal images, the planet shone like a lantern. But nearby they noticed a faint dot — like a firefly. Calculations showed that two objects describe the picture better than one. However, it's most likely a lens flare — like a ghost of a lamp. Still, we can’t rule out a pair of massive bodies circling each other.

The telescope’s sensitivity is impressive: it clearly sees objects 30 times fainter than the main planet, even at temperatures of −130°C — colder than any earthly freeze. Measurements of light allowed calculating at what distance moons can be discovered. JWST is now capable, for the first time, of directly photographing moons of other worlds or entire double planets.