Is there a relationship between Earth's gravitational field strength and it's magnetic field strength?

Question

See these two articles:

http://news.bbc.co.uk/2/hi/science/nature/1196652.stm
http://www.thunderbolts.info/tpod/2005/arch05/050623impossible-dinosaur.htm

Purportedly, Earth's gravity would have had to have been 1/3 weaker than it is today for Dinosaur's to exist, apparent from some simple math applied to proportional muscle masses and strengths.

At the time the Dinosaurs existed, Earth's magnetic field was exactly 3 times stronger than it is today.

Gravity follows many of the same laws as magnetism at close distances.

I was just wondering if Gravity was really so mysterious, some result of invisible and undetectable forces or if it might just be the circulation of some particular particle, maybe we will soon be able to manipulate it like we do magnetism.

I realize that they are two separate entities and can exist separately of each other. What I'm asking is if the gravity changes on Earth, would it affect the Magnetic field by changing something, such as the flow of iron in the core. I also realize that it's highly unlikely that the Earth's gravity changed, but the scientist in the article does present a feasible case. Yes I passed physics with flying colors.

Answer 1

I suspect the second reference is pseudoscience. We have no evidence of any significant variation in the strength of gravity, at least beyond the inflationary epoch. We do have evidence of dramatic changes in earth's magnetic field, however, including reversals of its polarity. A dinosaur is not constructed the same as a human. Lifeforms are only slightly sensitive to magnetic fields. Gravitational and electric fields are both inverse square laws. At this point, gravity is definitely mysterious. It is less understood than QCD (quantum chromodynamics).

Answer 2

Magnetism and gravity are different forces. Some of the planets do not have magnetic fields, but still have gravity.
Atomic nuclei have gravitational forces, but I think they only have magnetic forces as ions. I may be wrong about that.

Answer 3

You're really off-base here. Earth's gravitational field is due to its MASS. It's magnetic field is probably due to the rotation of molten iron at the earth's core.

The moon has a gravitational field ( albeit 1/6 of that of the earth ) but I think it has no magnetic field.

Answer 4

I was under the impression that they were two seperate entities. Although they do share similarities, gravitaional, magnetic, and even atomic forces are independent of each other and unique to themselves.

Answer 5

Did you pass physics class? (:)