Pluto -- planet or not?
November 17, 2009 10:31pm CST
I've been wondering about this question for some time... Is Pluto a planet? If it isn't, then what is it?
• United States
15 Jan 10
Hi 1starry night. Pluto is no longer considered a planet because it doesn't have the mass that we origionally thought that it did. In fact one of Pluto's supposed moons is large than the planet itself. In fact pluto has so many satellite objects rotating around it that they now believe it may be it's own mini system. However there is nothing over there with enough mass to literally be a planet. Go to you tube and type in Pluto and you will find scientific explanations of why it has now been downgraded to at best a planetoid rather than a planet.
• Tripoli, Libya
18 Nov 09
Some say it is a rogue moon originally from Uranus but more likely from Neptune. The other school of thought is that it is a large asteroid that got caught in the pull from the sun which locked it in an orbit. One thing is for sure it is not a planet. I have also heard of another possibility and that Pluto is a remnant of a comet. You decide.
18 Nov 09
Hi there, if you look at the orbits of the 'Planets', you will note that they exists in a similar plane, known as the ecliptic. Pluto does not orbit in the ecliptic, it passes high above and then below it. The orbit is also higly eccentric, (not circular). Therefore, it cannot be considered as a normal planet. There are many other large objects out past Pluto that also have strangely inclined orbits. None of these can be considered planets, they are dwarf outer solar sytem objects, some objects are larger than Pluto and much further out. Neptune is the last of the true planets. Barring future discoveries.