NASA is preparing to explore a mysterious asteroid made of metal, the US space agency has announced. The value of all the nickel and iron that NASA believes makes up 16-Psyche’s oddly-shaped space rock in the asteroid belt’s outer reaches is estimated at $10,000 quadrillion. This is a massive sum, but NASA’s Psyche mission, which has now received approval to enter the final development stages before manufacturing begins for its 2022 launch, is actually after a much bigger prize – revealing how Earth's origins. NASA researchers believe asteroid Psyche is key to understanding how planetary bodies are formed. This is...