Planet nine - exo planet in our solar system

Nine. The number of the planet that we have been memorizing so far from our school time seems to be slightly varying.

Planet Nine - the first exoplanet found in our solar system says the scientists.. An exoplanet is a planet which should have orbiting around a star and pulled by sun into our solar system. Studies says that the planet nine would have been stolen about 4.5 billion years ago.

"It is almost ironic that while astronomers often find exoplanets hundreds of light-years away in other solar systems, there's probably one hiding in our own backyard," study lead author Alexander Mustill, an astronomer at Lund University in Sweden, said in a statement