Japanese astronomer claims to have discovered ninth planet in solar system 'hiding behind Neptune'Sep 6 (AZINS) When we were in school, our Solar System had nine planets. Then scentists decided that Pluto wasn't a planet anymore, and suddenly we have eight planets.

Now, it is learnt that what we learned in school was absolutely correct. However, Pluto isn't the planet. The planet in question is a tiny planet hidden behind Neptune, which has conveniently been called Planet 9.

Discovered by a Japanese astronomer from the University of Tokyo, the planet has been spotted just once.

The whole idea, however, that a Planet Nine exists, came in 2014 when a planetoid was discovered in the far-ends of our solar system, one that orbited the Sun. It was predicted later that the planetoid weighs approximately 20

Earth masses (20 times the mass of our planet) and follows an elliptical orbit which is about as much as 1,000 times more distant from the sun than Earth is.

NASA had also released a statement about how far Planet Nine is, saying that it may be 20 times further from the Sun than Neptune is.