I do know the L points. As I understood it, the body in the Lagrangian orbit must be much smaller than the primary body for the system to be stable. You're saying, though, that L3 is not actually stable regardless of the ratio of masses?
And Helios, I'm aware the initial configuration is...
Is it possible to have two planets orbiting opposite each other across their star? Either with the two being of roughly equal mass, or with one giant planet and one terrestrial?
Everyone's heard of the old "Counter-Earth" theory, which of course is wrong, but I was wondering if given our...