I heard that the core of the earth might be nuclear like the surface of the sun.

Would venus, being the sisterplanet of earth AND having a runaway greenhouse effect be a good comparison for this, or does the core composition/dynamics/rotation differ too much???

All I can say is, venus aint no asteroid belt yet.

LOL

The idea that the earth could blow up is ridiculous.

For one, the poster who claimed there is no gravity at the center of the earth, is correct. Think about it. Which way is "down" at the center?

The simplication of the spherical gravitational calculus, is that any shells of the earth "above" you as you descend into the earth, cancel out their gravitational attraction, because the mass of the shell above you then pulls "up" in all directions. Only the part of the earth "below" you then effectively produces net "down" gravity.

Obviously, you could stand on an asteroid, but because of its relatively small size and gravity, simply jumping would probably be enough to be "escape velocity" to break one free of an asteroid's gravitational attraction, unless it is a "big" asteroid.

Then if there was still net gravity at the center of the earth, it probably wouldn't be enough? If it was, why hasn't Jupiter exploded yet? Isn't Jupiter a "heavy" planet? Because there is no solid core? Just a "gas giant"? (Jupiter would be a scary place to "crash land"? Perhaps there is no "bottom" to land on before your spacecraft gets crushed?)

Besides, don't the astronomers claim that earth has far too little mass to ignite some new star? Supposedly too much mass acreting into a planet, would produce such crushing pressures and heat, as to ignite a nuclear reaction and give birth to a star? A mass far greater than that of earth.

Anyways, I have another theory. I think radioactive decay does occur beneath the surface, of the earth, and the heat becomes trapped, and builds up. Atmospheric temperatures or some "global warming" hoax theory, would have little effect, as the temperature inside the earth is very high compared to that of the atmosphere. But I think it does relate to volcanic activity and earthquakes. And perhaps Biblical prophecies of an increase in earthquakes toward the Biblical endtimes.

I doubt that the core of the earth remains molten from God's creation of it, but rather it is "melting" due to radioactive decay and accumulating heat. But I don't think it is anything that will bring about the "end of the world," or much anything to worry about, but rather a sign of how God created the world, and what happened to the world as it began decaying after Adam and Eve sinned and got themselves kicked out of the Garden of Eden. God will bring about the "end of the world" when it is God's time to do so. Perhaps an occasional volcano or so, are enough to release some of the pent up heat, and some heat leaks up through the surface of the earth? As the decay is slow and has to heat up massive amounts of mass that then slowly disperse the heat.

Has anybody ever done any experiment or obtained any measurements to test my theory? Perhaps the change is so slow it is hard to measure?

I was under the impression that radioactive decay eetc is what is driving the tectonic plates, and volcanoes. Therefore, there should be no increase in readioactive decay heat. Furthermore, there seems to be less massive geological events now than tehre used to be, eg less massive lava outflows, etc, although im not sure how much less.

It wont be in our life time so whos to worry

Im more about the past billion years, althogh thats maybe too general. Certainly theres less vulcanism than when the earth cooled down from molten. :D