Let's say aliens we trying to drop rocks on the Earth to kill us all. What could we do so we don't die?

• Aliens are orbiting the Earth
• They are dropping materials they have mined from the moon.
• The rocks are fired from a high orbit, and they spirl inward.

What can humanity do?

Let's say aliens were trying to drop rocks on the Earth to kill us all. What could we do so we don't die?

• Aliens are orbiting the Earth
• They are dropping materials they have mined from the moon.
• The rocks are fired from a high orbit, and they spirl inward.

What can humanity do?