Mars is the Red Planet, but turns out the moon has the makings of a reddish cast, too. Yes, scientists have found rust on the moon. The question is: why?

All combustion reactions (such as the burning of coal) are exothermic. Incredibly, the reaction between iron and moist air that produces rust is a very exothermic process and generates lots of heat.

Rust is that red, sometimes orange or brown stuff that appears on metal. It's a chemical reaction called corrosion, and a ...