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

Discover the order of planets in the solar system. From Mercury to Neptune, explore our solar system and learn ... At the center is the sun, a yellow dwarf star that contains 99.8% of the solar ...

"A planet orbiting not just a binary, but a binary brown dwarf, as well as being on a polar orbit, is rather incredible and exciting." ...

Earth has four seasons, but do other planets in our solar system also have hot summer days and cold winter nights?

Indeed, other planets, dwarf planets and moons in our solar system do have seasonal cycles ... so "there's almost no seasonal change at all," Byrne said. On the opposite end of the spectrum ...

Our solar system may have a ninth ... of a planet within the outskirts of the solar system is the activity within the Kuiper Belt, an unusual clustering of icy bodies -- including comets and dwarf ...