Is pluto still the 9th planet?

Question

some say it is some say its not. i am in search of the real truth

Answer 1

According to the International Astronomical Union, Pluto isn't a planet.

I'm really not fond of their definition of the word "planet".  In particular, it depends on where the object is, and it's orbit, and so on. By a strict interpretation of the IAU's definition, only Jupiter is a planet, as it's gravity dominates that of all other objects' orbits around the Sun.

My definition is: an object big enough to be in hydrostatic equilibrium that does not perform significant fusion over it's life time.

By this definition, Ceres is once again a planet.  Pluto is a planet, but not 9th. Several moons, like Ganymede, Titan and Triton are planets too.  There are some 40 known planets, which will be a joy for school kids to memorize.

Answer 2

No and that sucks.

Answer 3

Officially, no.

But it exists and is in our solar system. Scientists decided it did not meet the criteria of a planet.

Answer 4

it depends on the definitions.  many will just blindly follow the proclamations of some sort of committee that decides what a planet is and isn't.  

the larger philosophic principle here is that these definitions reveal more about psychology and history than they do about the properties of the universe.

a "planet" is whatever we define it to be.

Answer 5

no. pluto was considered a dwarf planent in 2006. Astronomers kept finding smaller planets past pluto and either they had to make them planets to or change the definition of a planet.

Answer 6

No, there's no "9th planet" anymore.  It was voted out of the astonomical lexicon about a year ago.

Answer 7

No, not really.  It's officially been down graded to a 'Dwarf Planet'  as well as 'Eris'  (the unofficial once-upon-a-time '10th' planet).  

It's popular belief that these are just a couple of the largest 'asteroids' from the Kuiper Belt. (pronounced 'piper') that exists past Neptune.

Answer 8

No

Answer 9

well,earlier,i too usd to believe it to be truly a planet,but once,it was once published in a report that since its size is comparable to that of an asteroid,hence it would be somewhat irrelevant to consider it a planet.

Answer 10

Where have you been? Don't believe what other people say, research it for yourself. Pluto was kicked out of the planet line long time ago, sweets.

a thumbs down? hah! just shows me i know one thing more than someone else.

Answer 11

technicaly its a dwarf planet, so is eris (9th and 10th) but in my mind, i think we should upgrade to 10 planets not downgrade to 8

Answer 12

No, Pluto is considered a minor planet. It's not considered a planet anymore due to it's irregular orbit around the sun, like other companions or minor planets such as Sedna.

It's recently been dubbed a "Plutoid".