Add Yahoo as a preferred source to see more of our stories on Google. This artist’s concept depicts a potential volcanic exomoon between the exoplanet WASP-49Ab, left, and its parent star.

NASA scientists believe they have found indirect evidence of a moon orbiting an exoplanet with similarities to Jupiter's moon Io, pictured here. Credit: NASA / JPL-Caltech / SwRI / MSSS Scientists ...

Scientists have spotted a few thousand exoplanets, or planets orbiting stars other than our sun. Exomoons are another story. There have been some potential exomoons, but nothing definitive. Now, a ...

After decades of searching, astronomers might finally be on the verge of discovering thefirst confirmed exomoon, a natural satellite orbiting a distant exoplanet. If the findings hold up, it could be ...