Once we have more rock samples and soil samples, we will have a lot more to go on. Nothing is better than having a person on the ground. |
This research shows that even after the collisions happened, the earth had a profound effect on the moon. |
We don't fully understand the way these minerals settle out under temperature and pressure, so the exact composition of the moon is difficult to determine. We have to use gravity measurements to calculate the density of materials, and then use that information to extrapolate the likely composition. |