do we have conclusion about the number of planet in our solar system?

no, astronomers are trying to define what a planet is, but it isn't easy. many astronomers favor the reclassification of the bodies in the solar system into three groups, the rocky terrestrials, the gas giants, and the ice dwarfs. there are four rocky terrestrials and four gas giants, but there are hundreds of known ice dwarfs. this is called the kuiper belt. kuiper belt objects are bodies like pluto, quaoar, sedna, 2003 UB313, and 2003 EL61. 2003 UB313 (the official name of xena) is about five percent bigger than pluto, but pluto was the first kuiper belt object discovered.

read this page:
http://en.wikipedia.org/wiki/Kuiper_belt

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No, we don't yet have a conclusion (and ignore the ones calling you a dumbass or nitwit ... the first guy is a dumbass and the second one is a nitwit, or they would know that the question is far from settled). It's a legitimate question.

The official number *currently* is 9. But this may change later this year.

warmsoapywater has it correct. The problem is that we've never had a precise definition of what a 'planet' is ... i.e. what distinguishes a planet from an asteroid. The IAU (International Astronomical Union) is scheduled to come up with a more precise definition later this year.

Incidentally, it is not Sedna (which was discovered in 2003, not last year) that's causing the confusion. Sedna is smaller than Pluto, and is not the largest of the objects we find in that region of the solar system. The object currently known as 2003 UB313 (discovered in 2005) is larger ... in fact larger than Pluto. It's the best candidate for becoming officially our 10th planet (and will then get a better name ... currently 'Xena' is a nickname, but that is not a candidate for its permanent name if gets 'planet' status).

Oh, and debate is not "raging" about Pluto. Nobody is seriously considering 'downgrading' Pluto from its classification as a planet.

And it's not because "scientists are lazy and don't wish to form new models." (Why do some people bash scientists so much?) First, it takes a huge amount of effort to find and analyze these discoveries. Second, scientists are constantly refining the model with every new discovery. But scientists are *incredibly* diligent, and check each other's discoveries and conclusions over and over. And when they consider things like the definition of a word like 'planet', which we've been using for centuries, they don't do it lightly. Scientists take their time because they are *extremely* careful ... and that's how it should be.

officially we have 9 planets and the issue of sedna is being debated upon...otherwise we have no idea how many more planets exist in our extended solar system...it is expected that many more planets would be discovered in the upcoming years owing to the immense advancement in the field of space research...

No, there is not and will not be for a while... In a year or so we will officially concider 11 planets of the solar system as last year 2 were discovered... There is much debate around them because scientists are lazy and don't wish to form new models, but they are as much the planets as Pluto or Mercury... they have a different orbit but that's because of the passing system (likely) which dragged the outer planets out of the 2D disk...

To answer your question, no there is no conclusion

By most counts, we have 9, but debate is raging whether Pluto is a planet, based in part on the discovery of Sedna, a rocky outpost beyond Pluto's orbit. It seems that if Sedna is not officially a planet, there isn't much to allow Pluto's right as one, apart from Grandfather rights and the like.

It depends on what you mean by "planet." The word itself just means "wanderer" from the original Greek, so how many "planets" there are in our solar system depends on how we decide to define a planet.
Some astronomers feel that any solar system body that has enough self-gravity to pull itself into a roughly spherical shape qualifies, which is almost solely a measure of mass. If that's the case, there are about 16 planets that we know of (since several of the larger asteroids qualify under that definition), and probably a fair amount more KBOs yet to be discovered. Some astronomers want to stick with the "traditional" 9 planets, and just call new things something else (trans-neptunian objects, kuiper-belt-objects, etc.). The big debate about "demoting" Pluto a few years ago from planetary status was really all about the definition of "planet," Pluto didn't change at all :)

The fact is that our solar system is full of interesting objects, big and small, that are sometimes hard to fit into narrow categories. Personally I think we should just enjoy discovering new things, and not worry about how we define them. Call them planets, call them asterioids, call them whatever...just find them and study them :)

well, obviously people state there are 9 planets, but there have been several debates about others. I don't think everyone will agree with the 9 some say less some say more. And there is always a chance to find more

There are currently 9 planets, but just last year, NASA discovered a new rock, Sedna. They considered it too big to be a moon but too small to be a planet. Therefore, we still currently have 9 planets.

The friggin solar system has 9 planets dumbass