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Thanks gentlemen for your responses - very interesting. Your answers on the lack of detectable solar wobble if the sun has a brown dwarf partner makes sense, as does the long time frame for preventing showers of comets. But there seem to be 2 opposite views on the shape of the cloud here. One is that the solar system starts as a plane and other gravitational influences turn the Oort cloud into something else, the other that we start with a sphere and it becomes a disc due to gravity which leaves the Oort cloud alone. I like both! I'm still curious about people's thoughts on passing stars and gravitational tides.
I find this quite a fascinating area, contemplating such far flung regions of the solar system and I also enjoy the uncertainty of it all. I hope that there might be some more discussion.
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