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 ...

If you examine our solar system’s giant planets, you’ll notice right away that they’ve all got moons—a lot of moons. While Earth only has the one, Jupiter has about 100 that we know of (and likely ...

A new study published as a pre-peer-reviewed paper on arXiv and accepted for publication in Astronomy & Astrophysics suggests that a massive gas giant, HD 206893 B, located 133 light-years from Earth, ...

Astronomers have so far identified over 1,800 exoplanets orbiting other stars. And the Kepler space telescope (Opens in a new window)has identified several thousand more possibilities, some of which ...