Pluto
Pluto
(OP)
Any comments on the demoting of Pluto as the ninth planet of our solar system ?
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RE: Pluto
Gunnar Englund
www.gke.org
RE: Pluto
Regards,
RE: Pluto
-The future's so bright I gotta wear shades!
RE: Pluto
RE: Pluto
RE: Pluto
RE: Pluto
http://en.wikipedia.org/wiki/2003_UB313
www.SlideRuleEra.net
RE: Pluto
TTFN
RE: Pluto
I find it interesting that a group of several hundred of the smartest people on the planet have nothing better to do than to spend thousands (millions?) of man hours developing the first technical definition of a "planet". If Newton et al had bothered to write down a bad definition a few centuries back then just think what these big-brains could have done with the last couple of years.
David
RE: Pluto
RE: Pluto
RE: Pluto
RE: Pluto
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Pluto
RE: Pluto
The most popular working theory now is that Pluto used to be larger and that its moon was created by a large impact that broke the small planet into two nearly equal-sized chunks. Another theory is that it never re-coalesced into a planet due to the gravitational influence of Neptune.
The concept of a planet is not so much a scientific one, but a cultural one. It started out as something to describe celestial objects that did not behave as the stars. The planets appeared to wander and engage in odd behavior like retrograde motion. I think Pluto was kept in as a planet because so much effort was used to find it, and it’s the only planet to be discovered by an American. Only later with additional knowledge did the mistake become more apparent.
I think now that Pluto is out, the IAU will come up with a scientific definition of a planet instead of the culturally-based definition that has been used for so long.
"If you are going to walk on thin ice, you might as well dance!"
RE: Pluto
RE: Pluto
RE: Pluto
Here are the orbital inclinations in d m
M 7 0
V 3 24
E 0 0
M 1 51
J 1 18
S 2 30
U 0 46
N 1 47
P 17 09
The plane of the Earth's orbit is called the plane of the ecliptic, it is a fairly arbitrary datum, but at least we know where it is.
The accepted wisdom is that all the home-grown planets were all formed out of the same spinning disc of pre-stellar material. So all the gas in that cloud had the same angular momentum vector, so their spin vectors were aligned, even after they clumped.
Even odder is the phenomenon of orbital resonance, which is one of the reasons why Pluto and Neptune have never said hello.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Pluto
luis
RE: Pluto
RE: Pluto
Question: What made you select our Earth for your visit? The women?
Gunnar Englund
www.gke.org
RE: Pluto
You started an idea for another Hollywood ET flick. Martians (or any other damn ETS) filing a case, in universal court of law, on you for your comments. Better get some proofs that there are no women elsewhere.
RE: Pluto
Perhaps I should rephrase more PC: What are you after? AC or DC?
Gunnar Englund
www.gke.org
RE: Pluto