How many planets are in the solar system..Now that pluto is considered not to be a planet?
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The answer is officially 8, and it's been a long time coming! I've always disagreed with Pluto's classification as a planet. There is a great debate among astronomers about what constitutes a planet. Some believe that Pluto should be classified as a planet as well as 18 or more other objects in the solar system!
There are many objects in the Kuiper Belt and Oort cloud, as well as many asteroids in the Asteroid Belt, but most people don't call them planets because they are so small; small objects in space have little gravity, and thus have negligible atmosphere and aren't as round as the official planets. Three "dwarf planets" in our solar system include Ceres, Pluto, and Eris.
Edit: What wrldzgr8stdad is talking about is "Nemesis," a hypothetical brown dwarf star that is a companion to the Sun. It was just a theory someone made 20 years ago and we haven't found evidence of it yet. At any rate, this imaginary star isn't a "mystery planet." There are 8 planets under the IAU classification.
Earth, Mercury, Mars, Jupiter, Venus, Saturn, Neptune, Uranus so Eight
some say theres another "planet x" but thats full of it
8
8
mercury, venus, earth, mars, jupiter, saturn, neptune, uranus
There are 2 more planetoids that have the same characteristics as pluto so if they allowed those we would have had 11 planets.
it's still at 9. though most people don't know it, there is what is known as a super giant that has an extremely eliptical orbit. once every 50 billion years or so, it swings in close to the sun, dragging space debris with it. after just a few weeks of jostling it's celestial neighbors, it makes it journey back out into the depths of space. some people refer to said planet as "planet x". while others perfer the name "nexus".
I'm sure its back to 9 again, I think they found something else to call a planet
There are 9 planets, namely,
1) Mercury
2) venus
3) Jupiter
4) Mars
5) uranus
6) Neptune
7) Earth
8) Saturn and
9) the new planet I dont know its name.
So, still there are 9 planets.
8
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
2006 definition of "planet" by the International Astronomical Union (IAU):
* is in orbit around the Sun,
* has sufficient mass so that it assumes a hydrostatic equilibrium (nearly round) shape, and
* has "cleared the neighborhood" around its orbit.
if only the first 2 criteria are met its' called a dwarf planets(Ceres, Pluto, and Eris).
eight planet is in solar system. now pluto is a dwarf planet.
9
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