Question: need details of a particular "rogue planet"?

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Answer #1:

The most common material for small planets is Silicon and Iron.

If it were about half the size of earth it would have half the gravity.

To have twice the gravity it would need to be made of mostly lead or gold (interesting plot twist) but both elements are fairly rare.

It's mass would be about 2 earths

Scietific name is "rogue planet", it means a planet not orbiting a sun.

Core lead or gold, thin surface shell of anything you fancy, Sulfor (sulphur) has a nice yellow colour

Answer #2:

How would it have been "created" (how did it form?)-could of been sling-shot out from a binary cannibal star system

Answer #3:

For a planet mass is proportional to gr^2, where g is the gravity and r the radius.
So "about half the size of Earth, have a gravity of about twice the gravity of Earth" implies a mass half that of the Earth.

Next density is proportional to mass/r^3, so it would have to be 4 times as dense as the Earth.

As Alan said, it would have to be made of gold or lead....

> (IE brown dwarf?)

That is another beast: a brown dwarf is a failed star, at least 15 times more massive than Jupiter, but with a comparable size. That would a gravity far too high, not to mention a surface temperature of 500K or more.

Answer #4:

Chthonian planets are the remnant cores of once massive gas giants. They can be any element heavier than hydrogen and helium but mostly are silicon and iron. They can also be called canonball planets. A slingshot gravitational assist between colliding binary stars can send such planet into a rogue drive across interstellar space.

Clear skies!





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