There's a going theory out there that an undiscovered planet resides in our solar system somewhere beyond the orbit of Pluto. But NASA just finished an exhaustive survey — and it completely failed to turn up any evidence that "Planet X" exists.
We might just be on the verge of discovering a real Planet X, according to astronomers John Matese and Dan Whitmire. Subtle gravitational influences on comets way out in the Oort Cloud suggest there could be a huge gas giant affecting the other objects, and now NASA's Wise space telescope has given us the data to…
Far away in the frozen outermost depths of our solar system, there might be a hidden planet four times the size of Jupiter. This secret companion to the Sun could be responsible for sending comets into the inner solar system.