Hi, someone please can try to tell to what imply here "not following what it should?
So, now watch what happens. We have better and better measurements, and we find out Newton's laws failing, Mercury's orbit is not following what it should, that's the closest planet to the Sun, well, we've been down that path before! Just throw in another planet that we can't see, and that'll fix it! So, thus was introduced planet Vulcan, this would be a planet very close to the Sun, so close it'll be hard to see, it'd be lost in the glare.
The inner planet Mercury has an orbit that deviates from what is predicted by Newtonian mechanics. e. the orbit never changes when there are no other masses which would perturb the orbit.
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The inner planet Mercury has an orbit that deviates from what is predicted by Newtonian mechanics. In particular, the orbit precesses (the axis of the ellipse shifts in the orbital plane) when such a precession is zero in the two-body (Sun + planet) equations; i.e. the orbit never changes when there are no other masses which would perturb the orbit.
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