Einstein's theory, like Newton's, predicts that, in the absence of air resistance, all objects should fall at the same rate regardless of their masses. Consider the following hypothetical experimental results. Which one would indicate a failure of Einstein's theory?
1) Scientists dropping balls on the Moon find that balls of different mass fall at slightly different rates.
2) Scientists dropping balls on Earth find that balls of different mass fall at the same rate.
3) Scientists dropping balls on the Moon find that balls of different mass fall at the same rate.
4) Scientists dropping balls on Earth find that balls of different mass fall at slightly different rates.