Astronomers identified a second possible exomoon

The candidate orbits a planet circling a sunlike star about 5,700 light-years from Earth

an illustration of the exomoon Kepler 1708 b i, shown as a blue-green orb, orbiting a large, Jupiter-like exoplanet

The exomoon Kepler 1708 b i (green-blue orb in this illustration) circles a Jupiter-sized exoplanet that in turn orbits a sunlike star about 5,700 light-years from Earth.

Helena Valenzuela Widerström

Some of the same researchers who found the first purported exomoon now say that they’ve found another.