Scientists have made an exciting discovery: they think they've found the first cave on the moon! This cave is located at the bottom of a huge pit, about 200 feet deep, in the Sea of Tranquility, or Mare Tranquillitatis. The pit is about 230 miles from where Apollo 11 landed in 1969, the first time humans set foot on the moon.

The cave was first spotted by lunar satellites in 2009, but it wasn’t until recently that scientists realized it could actually be a cave. They analyzed old images ...