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Q.

The unit usually used in professional astrometry is:

 A.

parsec

 B.

light year

 C.

Hubble length

 D.

none

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Solution:
Option(A) is correct

The light-year is most often used when expressing distances to stars and other distances on a galactic scale, especially in non-specialist and popular science publications.

The unit usually used in professional astrometry is the parsec (symbol: pc, approximately 3.26 light-years; the distance at which one astronomical unit subtends an angle of one second of arc)


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