The moon's rotation and vocab

Earth turns around an imaginary line called ​

​a(n) ______________________.

fourth-grader in the United States does an experiment in her science class. At the same time, a fourth grader in China is asleep. Why is it daytime in the United States while it is nighttime in China?

The path that one object takes around another object in space ​

​is its ______________________.

When one object moves around another in space ​

​it _____________________

A force that pulls objects in space toward each other ​

​is ______________________.

When the moon moves around Earth one time, it is one ​​complete ______________________.

The picture is a two-dimensional model of how Earth moves in space. ​How long does it take for Earth to 1 complete one full rotation?

Why does the same side of the moon always face Earth?