My world has not been discovered yet, let alone explored or habited by a sentient species. It is roughly 145% of the size of Earth, and twice as dense, therefore having a significantly greater amount of gravity. Like Earth, the crust has very larget amounts of iron, but in nearer to the core it has much more gold, lead and tin. With the iron comes a strong magnetic field to protect the planet.
Work In Progress, I'll finish later.
