The discussion centers on the flat plane of the solar system, primarily the ecliptic plane where most planets orbit. This alignment results from the gravitational and rotational dynamics of the initial solar nebula, which formed a flat, swirling disk. While major planets maintain orbits close to this plane, some, like Pluto, have significantly inclined orbits. The Oort cloud, in contrast, is roughly spherical due to gravitational interactions with giant planets, although its innermost region may also exhibit a planar structure.
PREREQUISITESAstronomy enthusiasts, astrophysicists, and students studying planetary science will benefit from this discussion, particularly those interested in solar system dynamics and formation theories.
Borek said:That's not exactly true - while planets orbits do lie close to ecliptic, they are all more or less inclined.
From what I remember initial cloud from which Sun and planets formed get flat as a result of gravitation and rotation.
D H said:This question was asked just a couple of days ago. See [thread=441523]this thread[/thread] and my response in [post=2951827]post #2[/post].
The Opik-Oort cloud is roughly spherical. The members of the Oort cloud have, in many instance, been ejected from the solar system by gravitational interaction with Jupiter or the other giants. Since the ejection can be in any direction they tend to form such a sphere. I think there is some thought that the innermost part of the cloud is also planar, like the rest of the system.AC130Nav said:What shape is the Oort cloud?