Astronomers in the United States think they may have discovered another planet in our solar system.
Researchers at the California Institute of Technology say they have found evidence of another heavenly body far beyond the orbit of Pluto.
The object is thought to be about ten times the mass of Earth and is already being referred to by experts as ‘Planet Nine’.
The man who thinks he may have discovered the distant new rock is most famous for previously demoting Pluto to dwarf planet status, reducing the number of planets in our solar system to eight.
Despite this, he announced on twitter on Wednesday that he does think that the solar system has nine planets after all.
The discovery still has a long way to go before being proven, however.
The scientists say all the evidence they have found so far is circumstantial and no one has even seen it yet.