Photographs of planets can fool you. A close crop of swirling cloud bands or a patch of rusty dust can look like almost ...

Outer space is, for lack of better words, infinite. For thousands of years, humans have tried to comprehend the vastness of space, and yet so much remains unexplored and undiscovered. While space ...

Our definition of a planet has changed over the years — causing a bit of confusion. | Credit: wasan prunglampoo/Getty Images Over the past 250 years, the number of "planets" in our solar system has ...

The solar system lost its ninth planet back when Pluto was demoted to a dwarf planet, but research might indicate that there is a distant Planet Nine out there.