We used to think moons were the boring sidekicks of the solar system. For decades, we treated them like cosmic leftovers — cold, dead rocks that did nothing but tag along with their parent planets. We ...

Venus is one of the solar system's most unusual planets. It may sometimes be called "Earth's twin" because of its similar ...

Jupiter hosts more than 100 moons, with most attention focused on the four Galilean moons: Io, Europa, Ganymede and Callisto.

The landers are not always successful. And so then you’ve put in blood, sweat, and tears to get your research project to the ...

We have an idea of what the solar system's past was like: It was violent and chaotic. However, we are still studying how violent it was. Current models suggest that at some point after their formation ...

Humans love an origin story. And in space science, there is no greater question than why Earth is the vibrant, living planet we see today. As humans return to the heavens, understanding our planetary ...

The moon could have formed within just five hours of a colossal collision that rocked the early Solar System 4.5 billion ...

Add Yahoo as a preferred source to see more of our stories on Google. An artist's conception of the exomoon, foreground, with its planet, center, and its star, left —ESO/M. KORNMESSER What has eluded ...