Asteroid 16 Psyche, a metal-rich world roughly 225 kilometres wide orbiting between Mars and Jupiter, may contain extraordinary amounts of iron and nickel — enough that back-of-the-envelope estimates

The number attached to asteroid 16 Psyche is so large that it almost stops being a number. Around $10,000 quadrillion. Ten quintillion dollars. More than the annual output of the entire world economy by orders of magnitude. That figure has followed P... [8238 chars]