Currently, the Moon takes 27.3 days to go around the Earth. Suppose a supervillain shifted the Moon into a new, lower, circular orbit. How long would it take for the Moon to go around the Earth in its new circular orbit?

Less than 27.3 days

Step-by-step explanation:

The moon is the natural satellite of earth, which orbits around the earth, completing its revolution every 27.3 days. It gives us light at night, which is actually supplied from the sun and is reflected from the surface of the moon to earth.

If the radius of the moon's circular orbit is changed, that is either increased or decreased, then the duration of its revolution changes.

A higher, circular orbit compared to the current stage, will take time more than 27.3 days to complete one revolution around the sun. But, a lower circular orbit will take less time (less than 27.3 days) to complete one revolution around the earth.

Hence, in the given condition, if a supervillain shifts the moon inward, reducing the radius of the circular orbit, then it will take less than 27.3 days to go around the moon.