- #1
Jim Ostrowski
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Last week there was a documentary program on Nat Geo I believe having to do with the composition and origins of comets. The narrative seemed to imply that comets originate within & are rather randomly dislodged from a spherical shell around the Solar System called the Oort cloud. This dislodging of the comet supposedly takes place when one of the outer planets such as Pluto or Neptune passes near the shell, haphazardly pulling a random comet out of the Oort cloud causing it to fall towards the sun (!). This explanation also seems to entail that the comets comprising the shell were formed out of the original dust and debris that accumulated into the aggregation and eventual formation of the solar system billions of years ago.
Do I have this right? Does the above sum up the current thinking as to the origin of Comets?
Somehow, none of this seems right to me, just intuitively speaking.
For one thing, isn't it a fact that many comets have orbital trajectory planes highly inclined from the Ecliptic plane of the solar system? How would the outer planets have been able to influence comets say 60 degrees or more inclined from the celestial equator?
As to how the individual comets in the Oort cloud shell stay suspended there unless influenced by an outer planet controverts my understanding of Newtonian Gravitation. The outer boundaries of the shell are nowhere near the where the influence of the nearest stellar neighbor Proxima Centauri would start pulling things in that direction, are they?
How does cometary material just stay "suspended" there in the Oort Cloud and not either fall towards the sun or towards the nearest gravitational influences such as nearby stars or perhaps even the galactic center?
Jim Ostrowski
Do I have this right? Does the above sum up the current thinking as to the origin of Comets?
Somehow, none of this seems right to me, just intuitively speaking.
For one thing, isn't it a fact that many comets have orbital trajectory planes highly inclined from the Ecliptic plane of the solar system? How would the outer planets have been able to influence comets say 60 degrees or more inclined from the celestial equator?
As to how the individual comets in the Oort cloud shell stay suspended there unless influenced by an outer planet controverts my understanding of Newtonian Gravitation. The outer boundaries of the shell are nowhere near the where the influence of the nearest stellar neighbor Proxima Centauri would start pulling things in that direction, are they?
How does cometary material just stay "suspended" there in the Oort Cloud and not either fall towards the sun or towards the nearest gravitational influences such as nearby stars or perhaps even the galactic center?
Jim Ostrowski