The Moon is believed to have been formed as a result of an impact of a Mars-size body into the early Earth. Here we present a simulation of the first 24 hours following this giant impact. It is color-coded according to entropy of the rocks which ranges from dark-red at the coolest thermal state to bright-yellow is the hottest. The gray color represents iron. By looking at the thermodynamics during the impact, we are able to draw connections between dynamic models such as these and the geological record.