what is the name of the tenth planet of the solar system & who discovered it?

Answer 1

there's lots of info here with suggested names etc.

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

Answer 2

The Planet X hypothesis, first put forth by Percival Lowell in the late 19th century, stated that there was a fifth gas giant beyond the orbit of Neptune, providing the most common basis for the existence of a tenth planet. The X stands for unknown, rather than the Roman numeral for 10 — when Lowell postulated Planet X, the known planets totaled eight. Planet X was intended to explain perceived anomalies in the orbits of the outer planets. More accurate measurements taken by space probes such as Voyager 2 caused the anomalies to vanish without the need for an extra planet, and the hypothesis was discredited in the 1990s.

With the discovery of the Kuiper belt, the astronomical community began instead to increasingly expect the status of tenth planet would most likely be awarded, if ever, to some other Pluto-like object. The newly-discovered TNO 2003 UB313 is the most popular candidate for status as the tenth planet. Whether it is elevated to this status will depend largely on clarifications to the definition of the term "planet" presently being undertaken by the International Astronomical Union (IAU).

Answer 3

"It's definitely bigger than Pluto." So says Dr. Mike Brown of the California Institute of Technology who announced today the discovery of a new planet in the outer solar system.
The planet, which hasn't been officially named yet, was found by Brown and colleagues using the Samuel Oschin Telescope at Palomar Observatory near San Diego. It is currently about 97 times farther from the sun than Earth, or 97 Astronomical Units (AU). For comparison, Pluto is 40 AU from the sun.

Answer 4

sedna