This research shows that even after the collisions happened, the earth had a profound effect on the moon.

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.

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.

We have tried to give the highest priority to the research that we need to get to the moon and Mars and beyond. Is the science scaled back? You bet it is. But is it no science at all? No, we're still trying to utilize this station all we can up there.

From the Earth to the Moon.

This is a long way off, equivalent to two thirds of the distance from the Earth to the Moon.