The discovery of a possible diamond planet got me thinking. What is more valuable, a planet made of diamond or a planet full of wood? A planet made of gold or a planet made of molybdenum? A planet filled with jewels or a planet where we could grow rice?

The answers, I think, are obvious. So why do we think that gold and diamonds and jewels are intrinsically valuable here? Gold and diamonds do have industrial applications, so there is some small amount of practical worth, maybe on the same level as copper and graphite, but they’re both artificially kept scarce making us believe that they have value in and of themselves. And really, if a huge hunk of gold rock was found in space, would it be worth anything to go and get it?