How can there be ice on the Moon?

Curious Kids is a series for children of all ages. If you have a question you would like an expert to answer, please send it to curiouskidsus@theconversation.com.

I have a question about ice on the moon. How is this possible? - Olaf, age 9, Hillsborough, North Carolina

We are lucky to live in a water world. More than 70% of the earth's ...