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Why is astronomy so planar?
The solar system, the galaxy, black holes (X-ray projection is usually depicted as a linear jet that is orthogonal to a plane of swirling gas), all of these phenomena are planar. What gives?
Why aren't the orbits of the planets at all different angles? Why don't we have a spherical galaxy? Is a plane somehow preferable?
When two objects pass close enough to each other to be captured gravitationally, they will either collide or rotate about each other in some sort of elliptical orbit. That orbit will always be oriented in a single plane as defined by the laws of conservation of angular momentum. As more bodies accumulate, the angular momentum of the accreting disk is transferred to new arrivals by means of further collisions and gravitational loads. The new entry may affect the older disk, if it is massive (moment of inertia) enough or spinning fast enough, but the end result will eventually settle into some sort of stable orbital system. Examples can be seen in the case of galaxy collisions, where the overall angular momentum is in the process of being sorted out between the original orientations. The general case of gravitational relative motion therefore favors either a single body spinning about a single axis, or a collection of bodies orbiting about a single axis. As a result, we can find and define most astronomical targets in the night sky in terms of three rotational planes that are most meaningful to us on planet Earth:
1. The plane of Earth's rotation about its N-S axis
2. The Ecliptic Plane
3. The plane of the Milky Way Galaxy.
Once you know how to find and orient yourself relative to these three planes, the night sky becomes much less confusing.
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