Is it at all possible for the sun to revolve around as many barycenters as we have planets in our solar system?
Why is the L3 Lagrangian point not perfectly stable? And why is the Earth-Sun L3 point a bit less than one A.U.?
Did we ever actually see the earth revolving around the sun? Is the geocentric model completely disproved?
If suddenly "knocked" or perturbed from its orbit, would gravity eventually return the Earth to its original orbit?
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