Scientists are intrigued after spotting a highly unusual celestial object lurking at the very edge of our solar system.

Today, it’s believed that Jupiter and Saturn, the largest planets, were the first to fully form, both within a few million ...

A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in ...

A neighbouring star getting too close to our solar system could drive it into pandemonium. Simulations suggest that a fly-by star would only need to nudge Neptune’s position by three times the ...