Planet definitions

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Tweefo (February 24, 2017, 17:39:14 PM):
When is a planet a planet and can Pluto now come back please.
But the Moon a planet? This definition is going to be just as confusing as the last one. In my mind, a planet is a round world, but not massive enough for nuclear fusion. A moon is something orbiting such a world. But now where do you draw the line where size is concerned, and like this article points out, should there be a line? Are all Saturn's ring particles (down to dust size) moons?
Spike (February 24, 2017, 19:10:01 PM):
I found this helpful: Seems we are going to be re-discovering Sitchin's 12th planet a number of times in the next few years. Fun times!
Spike (February 24, 2017, 19:15:10 PM):
Yay, I found it! There was a lot of coverage a few years back. I think this was one of the first re-discoveries of the vaunted planet Niburu. May there be many more ;)

(Sorry, should have edited not double-posted, but I got carried away, and who can blame me. It was a momentous moment for science!)
brianvds (February 25, 2017, 05:53:48 AM):
We need a definition, because we have to determine exactly how many planets the solar system has so that we can make kids memorize that number! We can't have them think about concepts and in the process perhaps learn to think for themselves!
Spike (February 25, 2017, 10:30:31 AM):
When is a planet a planet and can Pluto now come back please.

If we don't like the results of all this meddling and discovering we can start a petition. I hope Tweefo signed this one: ! Sadly, the petition is now closed, I tried to vote unsuccessfully.


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