Earth rotates on its axis. Earth revolves around the sun. The stars are moving through space. The gravity of the moon attracts the stars.
Two students notice that the constellation Scorpio is directly overhead as they enter a building. When they leave the building several hours later, Scorpio is no longer directly overhead. Which of these statements explains why Scorpio appears to be in a different location?

Options:
- Earth rotates on its axis.
- Earth revolves around the sun.
- The stars are moving through space.
- The gravity of the moon attracts the stars.

Earth rotates on its axis.