The controversy endures over Pluto's true status, but the solar system underdog continues to capture hearts across the globe.

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

In the 1840s, French astronomer Urbain Le Verrier noticed the outermost planet of our solar system at the time, Uranus, wobbled a bit in its orbit. He reasoned that there must be another planet ...

Pluto may not be a planet any more, but you still have a chance to see the distant dwarf planet at one of Michigan's ...

According to a pre-print research paper, which is yet to be peer-reviewed, an object 8 times the mass of ... properties of the orbits of our solar system's planets, which are not quite perfectly ...