The world's largest solar telescope has reached an important milestone. The data published now were obtained during the technical commissioning of the instrument. The world's largest solar telescope, ...

Ganymede, Jupiter's largest moon, possesses planet-like dimensions and a hidden ocean. This moon is larger than Mercury and contains more water than Earth's oceans. Ganymede also generates its own ...

Add Yahoo as a preferred source to see more of our stories on Google. Jupiter's giant moon Ganymede is the only known moon to have its own magnetic field — and it may be heating up in a process "not ...