Jupiter is already the biggest planet by far in our solar system, but new research suggests it was somehow once even larger than it is now. Twice as large, in fact. To put that into context, those ...

While the solar system is defined by the gravitational influence of the Sun, what lies above is a vast and largely unexplored region filled with fascinating phenomena.

This process, called accretion, is how everything in the solar system – planets, moons, comets and asteroids – came into being. Telescopes can see young solar systems being born.

The technical challenge here cannot be overstated. The reflected sunlight from such a distant object drops off as the fourth power of distance, making 2017 OF201 visible for only about 0.5% of its ...

The furthest it gets from the sun is 1600 AU, way outside the solar system. This far-flung orbit may be the result of an encounter with a giant planet, which ejected the candidate dwarf planet out ...