A decades-old cosmic mystery may finally be solved. Scientists now suspect that the strange X-ray glow from a distant white ...

There were multiple proposals on how to change it, though, in the end, the definition created a new class of dwarf planets and made a lot of people angry. Still, kids in school now learn that the ...

So 8 planets with the asteroids in between Mars and Jupiter. Then, beyond the orbit of Neptune there are countless smaller objects. We call them dwarf planets, of which Pluto is an example.