So exactly how many solar system moons have we found? The answer, it turns out, depends on your definition of a moon. The International Astronomical Union (IAU) officially recognizes 288 planetary ...

There are also moons in the solar system, that is objects orbiting around the planets. In fact just over 180 moons at the last count. And some of those moons are so large that if they were ...

Artwork: Uranus and its five largest moons had been thought to be inactive and sterile. The planet Uranus and its five biggest ... solar storm, which led to a misleading idea of what the Uranian ...

and nine months in orbit around the biggest moon in the solar system, Ganymede. The European Space Agency’s billion-dollar JUpiter ICy moons Explorer will be an exciting mission of firsts.