Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

Everything else — from the eight major planets to dwarf planets, comets ... in our solar system The solar system formed about 4.6 billion years ago from a giant rotating cloud of gas and ...

A planet circling at a sharp 90-degree angle to the orbits of its two host stars has now been confirmed. This discovery ...