Is there really any tenth planet in universe or solar system?
Question:
Answer:
Senda - smaller than pluto, not a planet.
2003 UB313 - bigger than pluto, not a planet
There are lots of objects just like Pluto out there, but right now it is a "planet" and the others are not. The IAU's Division of Planetary Science is currently working on the whole planet issue, and we are supposed to have some sort of resolution to this issue by august of this year. It is actually quite a mess over at the IAU right now.
As far as the universe goes? We have found almost 200 objects that we call planets, but they are orbiting other stars.
There has been a mass discovered that could potentially be a planet, but it should be noted that, technically, we have only "8" planets in our solar system, because Pluto is not technically a planet, since it does not fit the description of either a terrestrial planet (mostly made of rock and close enough to the sun that they may have a molten core) or a jovian planet (core is made of mostly silicate materials and is completely frozen, and also contain a lot of gas). Pluto is essentially a ball of ice...a giant snowball orbiting on the fringes of our solar system.
Beyond neptune is a belt of icy objects known as the kuiper belt. You can think of it as another asteroid belt, but the objects are mostly ice as opposed to rock. Pluto is now considered by many just to be the largest member of the kuiper belt. There have been other large kuiper belt objects discovered that are nearly the size of pluto, some people like to call these planets when discovered. The question is comes down to how you define a planet, many want to stop calling pluto a planet.
there is. SEDNA, beyond pluto
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