Final answer:
A star with a distance modulus of zero would be at a distance of 1 parsec.
Step-by-step explanation:
The distance of a star in parsecs is equal to the reciprocal of its parallax in arcseconds. Therefore, if a star has a distance modulus of zero, its parallax would be 1 arcsecond, and its distance would be one parsec. So, a star with a distance modulus of zero would be at a distance of 1 parsec.