Secrets on the Moon

Look up at the night sky. You can often see the bright Moon. It looks like a big ball in space. But what is it really like there? The Moon is very different from Earth. It has no air. This means there is no wind to blow things around. There are no clouds or rain. The sky above the Moon is always black, even during the day. This is a strange thing to think about! Because there is no air, things on the Moon stay just as they are. When people walked on the Moon, they left their footprints in the dust. Those footprints are still there today. They will stay for a very, very long time. The Moon keeps its secrets safe.