Define light year and parsec
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As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year. ... The preferred unit in astrometry is the parsec (approximately 3.26 light-years), because it can be more easily derived from, and compared with, observational data.
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1. Light year:-
It is a distance that light can travel in
one year.
Light year moves at a velocity of about
300,000km/sec.
2.Parsec:-
It is a unit of length used to measure the large distances to astronomical objects.
Parsec = 3.26 light years.
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