What is the Planet X Theory?

Answer 1

Planet X is a large hypothetical planet with an orbit beyond that of Neptune. The scientific basis of the Planet X hypothesis was broadly discounted in the early 1990s and today no significant portion of the scientific community believes it to exist.

The "X" mentioned in the name represents an unknown and is pronounced as the letter, as opposed to the Roman numeral for ten. At the time of its conception there were eight known planets in the solar system; its existence, first as a ninth planet, and then from 1930 until its demise as a tenth, was postulated on the basis of apparent discrepancies in the orbits of the gas giants, especially those of Uranus and Neptune. Those discrepancies have largely been resolved by modern measurement, removing the basis for Planet X.

Although Pluto was discovered as a result of the search for Planet X, it is not considered Planet X. Neither is Eris, even though it was at one point considered for reclassification as a planet under a proposal outlined by the International Astronomical Union (see 2006 redefinition of planet).

Answer 2

It is the "theory" that there is another planet out there that has a very different orbit than every other planet in the solar system and it was, in 2003, supposed to come back through, pass close to Earth, and cause the end of everything through pole shifts, earthquakes, and the like. However, by looking at a calendar, we can see that didn't happen.

The notion of such a planet has been around for nearly a century. It dates back to Percival Lowell, though he didn't quite picture it as the doomsday device it was later made into.

Answer 3

"Planet X is a large hypothetical planet with an orbit beyond that of Neptune. The scientific basis of the Planet X hypothesis was broadly discounted in the early 1990s and today no significant portion of the scientific community believes it to exist."

There are a number of science fiction stories which postulate a Planet X as Earth's twin, in Earth orbit but diametrically opposed, and therefore unobservable from Earth.

Answer 4

mathematics suggested that there must be
a 'planet X'
one logical distance beyond pluto
it is still possible for there to be an extra solar orbital sattelite
but since scientists have stripped pluto of being a planet
X would probably be named
tiny, rocky glob of ice and rock
floating in tenth place from the sun

Answer 5

http://en.wikipedia.org/wiki/Planet_X

Answer 6

It has to do with a group of planets who sleep together before they are married, don't believe in God, distrust the government , and don't respect parents.