If a planet were built (earth size) What would / could you use for the core ?

Answer 1

We can use wastes emanating from Human usages, Animal wastes, Industrial wastes, Nuclear Wastes, etc to make the core (around 245 million metric tonnes of it is produced in 2005 alone and is still increasing). This will make the core fertile as well as good use for waste by-products.

In order to create a replica or earth, it requires lots of molten lava. Hot stuff indeed!

Answer 2

Why/how would you "build" a planet?
scythian, without a core the planet wouldn't be dense enough to provide the gravity needed to keep objects on its surface
The core of the earth is solid iron. If it was molten the planet would be unstable. The gas giants are not "earth size"
Earth's magma does not contribute to the climate of the planet, it is 100% sun

Answer 3

Why have a core? If an artificial planet is built, with a surface that people could live on, an "eggshell" planet would do the job perfectly, and with far less material need. It makes no sense to put inside the shell a ridiculously vast amount of "fill" just for the sake of having a solid planet.

Addendum: There are FAR easier ways to "fend off dangerous cosmic rays via magnetic fields" that to fill up the ENTIRE core with iron!

Addendum 2: taimaishoo_666, you're right, if we want an Earth-like planet with an atmosphere, oceans, mountains, the works, we're stuck with conventional molten-iron core planets just like Earth, so if we wanted a planet to be located at spot "X", we'd have to haul another planet to spot "X", or assemble one from asteroids. Say, that's a good plot for a sci fic story, creation of a New Earth in a stable orbit using asteroidal and cometary material. If it turns out that interstellar travel isn't feasible, with very advanced technology this could be an alternative. The caveat is that, like EM bandwidths in communications, there's a limit to the number of stable planetary orbits in any solar system.

Answer 4

You would definitely need something like Iron ore core for a planet. However, not all planets are solid either. Saturn is a gas giant and has no surface. I watch the Science Channel all the time. Love it. Science is my favorite. Also like the other guy said, it would have to me molten in order to keep the planet warm not just by the sun, but with molten lava or iron in the center, it keeps things warm enough for life to grow. Eggshell???

Answer 5

Same as in earths, molten iron, so then we would have magetic fields that stop dangerous cosmic radiation and all that. Plus the denisty and the mass of the molten iron would be great enough to produce gravity, something that would be needed for a planet.

With having a solid centre that produces gravity there would be no need to waste enegry in producing gravity, it could be strong enough to produce an atmosphere, with the right concs you could produce an earthlike atmosphere with the aid of plants etc, and there would be no need for special airlock buildings and such once formed.

Answer 6

as the first answer states (an eggshell planet.. no core) thats impossible. life cannot survive with its natural recources which they need the from the energy of the core. which probably will be iron and nickel
hope it helped
- Caitlin Luhbeese