posted on Jul, 6 2010 @ 07:50 AM
There is a basic misunderstanding in the solar system shown by many of the posts. The solar system has a number of objects from a sun, to planets, to
comets and other smaller objects such as Eris and Pluto. All of these objects, and remember all, tug at each other with gravity. The motions seen in
the planets are due to the gravitational effects between all of the parts of the solar system. If all of the other objects were removed from the solar
system, then the earth's orbit would be slightly different. If Neptune were removed, then all of the planets would move slightly differently. If an
asteroid were removed, then objects in the solar system would move slightly differently. The difference with the asteroid is that the differences
would be so small that today's tools could not measure the difference.
A new planet is different. Add a new planet into the solar system and the motions of the planets would be measurably different. If there were an
unknown planet that would occasionally swing into the orbits of the known planets, then its presence would have a measurable effect. The planets would
not orbit as they do.
The movements of the planets tell us that no planet sized object can enter the orbits of the known planets.