By: Mark Brown, Wired UK
An astronomer from Southwest Reasearch Institute in Texas believes that the solar system once contained a fith gigantic planet, which was ejected from the galaxy. He occured that 600 million years ago an instability affected the orbit of the giant planets and scattered them into smaller bodies. Some traveled into the Kuiper belt and others traveled inwards. The possibility that the solar system had more than four giant planets appears to be more conceivable in view of recent discovery of a large number of floating planets in space. This can indicate that the planet ejection process can be a common occurence in the future.
Shantell Saavedra