For the first time in 2011 a proposal was made that there not four, but there were five big-sized planets during the formation of the solar system. For years, scientists have been debating who have caused the ouster of the fifth planet, either Jupiter or Saturn. Now, researchers think that the work would have been done by Jupiter.

Team member Ryan Cloutier, of the University of Toronto, has explained that planet ejection takes place due to the close encounter. In this process, one of the planets is at such a fast speed that it breaks from the gravitation pull of its host stars.

The researchers focused on moon and orbits. On the basis of trajectories of Callisto and Iapetus, which are the regular moons that orbit around Jupiter and Saturn, the researchers came up with computer simulations.

In the next stage, the researchers created a hypothetical situation in which they measured the chance of them producing its orbit as per the level that its host star is responsible for the ejection.

"Quantitatively, we compute the likelihood of reconciling a regular Jovian satellite orbit with the current orbit of Callisto following an ice giant ejection by Jupiter of 42 percent and conclude that such a large likelihood supports the hypothesis of a fifth giant planet's existence", affirmed study's co-authors. In the case of Iapetus, it is difficult for Saturn to eject an ice giant.