Students with a telescope are viewing the Orion Nebula which is a giant gas cloud and with stars in the Orion constellation in our galaxy, The Milky Way. It is 1500 light years away from the earth. A teacher is describing the immense size of the nebula that would swallow up hundreds of solar systems like ours. What unit of measure should be used to describe this galactic formation?

The unit of measure which should be used to describe the size of the galactic body mentioned in the question is

Astronomical Units.

Explanation:

Trying to measure the size of planets in Kilometers and Miles is futile as the numbers are too enormous.

Astrologists have invented metrics which keep it simple and one Astronomical Unit is equal to 149,597,871 kilometers (92,955 miles).

Cheers

answer; preconventional;