define light year and define parsec
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A LIGHT-YEAR IS THE DISTANCE THAT LIGHT TRAVELS IN A VACUUM IN ONE JULIAN YEAR .
PARSEC IS A UNIT OF LENGTH USED TO MEASURE THE LARGE DISTANCES TO ASTRONOMICAL OBJECTS LARGELY OUTSIDE THE SOLAR SYSTEM .
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The parsec ( symbol: pc) is a unit of length used to measure the large distance to astronomical objects outside the solar system. One parsec is approximately equal to 31 trillion kilometers ( 19 million miles) or 210000 astronomical units and equates to about 3.3 light year.
Light year;
It is a unit of astronomical distance equivalent to the distance that light travels in one year.
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