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Angular momentum is not conserved in a 2 similar mass planet system due to the presence of external forces, such as gravitational forces from other celestial bodies, which can affect the rotation of the planets and change their angular momentum.
In theory, yes, angular momentum can be conserved in a 2 similar mass planet system if there are no external forces acting on the planets and the system is isolated. However, in reality, it is difficult to find a perfectly isolated system, so angular momentum is often not conserved.
The distance between the 2 planets can affect their angular momentum because as the distance decreases, the gravitational force between the planets increases, causing their rotational speed to increase and their angular momentum to change.
Yes, there are other factors that can affect the conservation of angular momentum in a 2 similar mass planet system, such as the shape and size of the planets, the presence of other objects in the system, and the distribution of mass within the planets.
Yes, the conservation of angular momentum can be applied to other systems besides 2 similar mass planets, such as a spinning top, a rotating wheel, or a swinging pendulum. It is a fundamental law of physics that applies to all rotating or orbiting objects.