http://scitechdaily.com/astrophysicists-...ar-system/
EXCERPT: Numerical calculations made by researchers at the Complutense University of Madrid and the University of Cambridge reveal that there could be at least two unknown planets hidden well beyond Pluto. If confirmed, this hypothesis would revolutionize solar system models.
Astronomers have spent decades debating whether some dark trans-Plutonian planet remains to be discovered within the solar system. According to the calculations of scientists at the Complutense University of Madrid (UCM, Spain) and the University of Cambridge (United Kingdom) not only one, but at least two planets must exist to explain the orbital behavior of extreme trans-Neptunian objects (ETNO).
The most accepted theory establishes that the orbits of these objects, which travel beyond Neptune, should be distributed randomly, and by an observational bias, their paths must fulfill a series of characteristics....
EXCERPT: Numerical calculations made by researchers at the Complutense University of Madrid and the University of Cambridge reveal that there could be at least two unknown planets hidden well beyond Pluto. If confirmed, this hypothesis would revolutionize solar system models.
Astronomers have spent decades debating whether some dark trans-Plutonian planet remains to be discovered within the solar system. According to the calculations of scientists at the Complutense University of Madrid (UCM, Spain) and the University of Cambridge (United Kingdom) not only one, but at least two planets must exist to explain the orbital behavior of extreme trans-Neptunian objects (ETNO).
The most accepted theory establishes that the orbits of these objects, which travel beyond Neptune, should be distributed randomly, and by an observational bias, their paths must fulfill a series of characteristics....