Most of us grew up learning that there are nine planets in our solar system ... says Pluto should definitely be added back to the planet list — oh, and that there are over 100 other objects ...

Such an event is commonly known as a "planet parade," though NASA noted that the moniker is not a technical astronomical term. Here's a list of the planets that will be visible in some for this ...

This hypothetical extra planet, often referred to as "Planet Nine" or "Planet X" has been long-theorized to explain weird and ...