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Including Pluto
What are the 12 planets in our universe
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As I seem to recall, there are 9 planets in the solar system.
There is, however, a proposed new classification of the solar system which will have 12 bodies; eight 'classic' planets; three plutons, Pluto, Charon (previously considered to be Pluto's satellite), & 2003UB313; and one large asteroid, Ceres, from the asteroid belt between Mars and Jupiter.
At present, it is still a proposal, and has yet to be voted on or accepted.
So I still reckon that makes it nine at present.
There is, however, a proposed new classification of the solar system which will have 12 bodies; eight 'classic' planets; three plutons, Pluto, Charon (previously considered to be Pluto's satellite), & 2003UB313; and one large asteroid, Ceres, from the asteroid belt between Mars and Jupiter.
At present, it is still a proposal, and has yet to be voted on or accepted.
So I still reckon that makes it nine at present.
Hi Clanad, no problem about the cross-posting. How's things?
Ric.ror, you may have seen it reported today, but, as stated in my previous answer, it is at the proposal stage, and has yet to be ratified. It is an attempt to resolve the long-running argument about "whether Pluto is a planet or not".
So, as Clanad concurs, there are (present tense), nine planets.
Ric.ror, you may have seen it reported today, but, as stated in my previous answer, it is at the proposal stage, and has yet to be ratified. It is an attempt to resolve the long-running argument about "whether Pluto is a planet or not".
So, as Clanad concurs, there are (present tense), nine planets.
Word "planet" to be defined
Our solar system may have at least twelve planets, including Charon, Ceres, and 2003 UB313 (AKA Xena). That's based on an official definition of planet now being debated at the International Astronomical Union meeting in Prague. According to the definition, Pluto, Charon, and certain other small objects with tilted orbits would be deemed planets but part of a separate class called "Plutons." Astronomers will vote on the proposed definition next week. From National Geographic:
The IAU proposal says that a planet is an object large enough to have become rounded due to the force of its own gravity.
But it's not that simple. What counts as a planet also depends on what it's orbiting around.
A planet has to orbit a star, so rounded objects floating freely through space won't make the cut.
But if an object is orbiting another, much larger object that's not a star, it wouldn't count as a planet either.
Astrophysicist Alan Boss of the Carnegie Institution in Washington, D.C., is... critical of the proposed definition.
"It doesn't have the elegance I was hoping for," Boss said. "It looks like it was written by a committee of lawyers rather than scientists."
http://news.nationalgeographic.com/news/2006/0 8/060816-pluto-planet.html
Our solar system may have at least twelve planets, including Charon, Ceres, and 2003 UB313 (AKA Xena). That's based on an official definition of planet now being debated at the International Astronomical Union meeting in Prague. According to the definition, Pluto, Charon, and certain other small objects with tilted orbits would be deemed planets but part of a separate class called "Plutons." Astronomers will vote on the proposed definition next week. From National Geographic:
The IAU proposal says that a planet is an object large enough to have become rounded due to the force of its own gravity.
But it's not that simple. What counts as a planet also depends on what it's orbiting around.
A planet has to orbit a star, so rounded objects floating freely through space won't make the cut.
But if an object is orbiting another, much larger object that's not a star, it wouldn't count as a planet either.
Astrophysicist Alan Boss of the Carnegie Institution in Washington, D.C., is... critical of the proposed definition.
"It doesn't have the elegance I was hoping for," Boss said. "It looks like it was written by a committee of lawyers rather than scientists."
http://news.nationalgeographic.com/news/2006/0 8/060816-pluto-planet.html
. . . and then there were eight
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