cthia wrote:Oh no! Not THAT argument again! Are we really going to base the rarity of Earth's "rare" metals on the galaxy at large? Oh come on! Just because Earth wasn't in the right galactic lane to receive more of the "rare" metals when the universe was allocating metals doesn't mean Earth is a representative sample.
Look at Grayson. Metals are not evenly distributed. There could be gold planets out there that make Earth's gold rush look like... a few prizes in a Cracker Jack box.
Cthia, you're overreacting. The rarity of elements in the Solar System is fairly typical of this region of the galaxy. Yes, there will be variation, but the Solar System is a reasonable representative. No one has suggested that there won't be some systems of planets with more or less rare metals than Earth. What people were saying is that, if you mine the asteroids in most systems, you can get far more rare metals than you need or can use. Rare metals simply aren't "rare" for ordinary purposes on stellar scales.