Is Sedna classed as a real planet? What about Pluto?

peasypod

I think the jury is still out on Sedna... [Nov 20 04 6:18 PM] peasypod writes: Here's something to mull over: http://www.gps.caltech.edu/~mbrown/sedna/#planets Nov 20 04, 6:15 PM

Baloo55th

They seem to have decided that Pluto IS a real planet and not just an object from the Kuiper Belt. The Spitzer telescope has been taking infrared images of some of the Kuiper Belt thingies, and they're nowhere near as big as people had thought. And nowhere near as big as Pluto, either. (New Scientist 20 Nov 2004) Nov 20 04, 6:33 PM

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In which year was the planet Pluto discovered? How far is the planet Pluto from the Sun? Why do some scientists no longer consider Pluto a planet? Which planet is described as orange (pluto, saturn, mercury, uranus) ?

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