A 9th planet?

How many planets are there in our solar system? The number is 8. (There used to be 9 planets, but in 2006, Pluto was reclassified from a planet to a dwarf planet.) Don’t get too excited, some scientists say they have discovered evidence that suggests there might be a 9th planet out there beyond Pluto. It has not been found and nobody knows for sure if it truly exists, but the scientists who believe that it does are hoping that astronomers around the globe will help look for it.

Our planet takes one year to orbit the sun. If this planet number 9 is for real, scientists estimate that it would take it between 10,000 and 20,000 years to make one orbit around the sun. Here are two videos about it.

Did you know?

Neptune was the last planet discovered in our solar system in 1846.
Image Credits: http://www.caltech.edu for the image of what the 9th planet might look like
Sources: http://www.caltech.edu