Since January, China’s Chang’e-4 mission – an orbiter and a rover – has been exploring the far side of the moon, particularly the prized South Pole-Aitken Basin, an asteroid impact crater that stretches across nearly a quarter of the moon’s surface. It’s the biggest crater on the moon, as well as the deepest and the oldest. That’s long left scientists suspecting that Aitken may hold vital clues as to how the moon – and many other solar system bodies – evolved.

Now, the Chang’e-4 mission’s