I remember a few months ago I was listening to a sermon by a traditional Catholic priest (I believe it was father Voight) and he started talking about planet X and said that this planet will come close to earth in its orbit and the planet will cause mass chaos on earth including earthquakes and tsunamis and other disturbances and that this coming of planet X will be a part of God's chastisement of the earth for her sins. Just today I was listening to an internet radio show by Trad Cath Knight and he started talking about planet X also. I do not know what to think about it. I remember hearing about it on Coast to Coast AM years ago but I never took it seriously. Do you believe in planet X?

I consider Planet X to be on par with the X-Men, Racer X, and other cartoon characters named X.  + PG + gave good advice.

Planets do not simply appear out of nowhere and start causing calamities.  Whether one believes in a heliocentric or geocentric universe, the planets' movement in the heavens is constant and predictable.

According to those who believe in planet X, it has always been there but it is far away and hasn't been seen yet by astronomers. They believe it will quickly come from far away to close to us and we will not have a great deal of time to prepare for its effects.

Quote from: Dolores

Planets do not simply appear out of nowhere and start causing calamities.  Whether one believes in a heliocentric or geocentric universe, the planets' movement in the heavens is constant and predictable.

According to those who believe in planet X, it has always been there but it is far away and hasn't been seen yet by astronomers. They believe it will quickly come from far away to close to us and we will not have a great deal of time to prepare for its effects.

Again, this is not consistent with any logical understanding of the planets (both heliocentric and geocentric).  Any planet that is that far away could not approach earth that quickly, absent direct intervention from God in a highly unusual, unexpected, never-before-mentioned, and never-prophesied way.

It is relatively certain there are undetected planets beyond the orbit of Pluto. The discovery of Pluto, remember, was by Clyde Thombaugh, who was looking for a celestial body capable of perturbing the orbit of Neptune. However, more recent measurements of the mass of Pluto indicate that it alone can't be responsible for these perturbations, hence Neptune's irregular orbit is still unexplained, hence there are probably 1 or more undetected planets beyond the orbit of Pluto.

However, it is also relatively certain that none of these undetected planets penetrate the Solar System anywhere near the Earth. If they did, then they couldn't be responsible for perturbing the orbit of Neptune b/c the apogee of such an orbit-- its farthest point from the Sun-- would be far beyond the orbit of Pluto, & the velocity of Planet X near its apogee would be very low, so it would spend most of its time out there-- 'way too far away to have any effect on Neptune.

...so yes, these bodies almost certainly do exist; but no, they could never affect the Earth in any way.

...but-- leaving aside Neptune & Pluto-- is it possible for a massive body to exist that occupies a highly elliptical orbit that brings it close enough to the Earth every thousand years or so to cause disruption? Possible? Yes. However, we have absolutely zero evidence for it.

I consider the existence of such a "planet" to be quite possible and even very probable ... more an extremely large comet-like object that would originate from the Oort cloud.

I believe in the possibility of a comet which God uses to chastise the world.  If that is "planet x", then yes.  

In the realm of space, as compared to the realm of animals/plants, I don't believe that man is anywhere close to understanding "patterns" or "typical" behaviors of such things, ergo, if "planet x" were to "suddenly" appear, I would not be surprised at our lack of preparedness.