1 parsec = _________ metres.
Step 1 :Given
Step 2 : Calculation of 1 parsec
1. The radius of the earth's orbital is 1 astronomical unit (AU) = 1.5×1011m
2. 1 arc second = 13600th of a degree.
3. Anglesubtended(θ)=Radiusofearth'sorbitDistanceDistance=Radiusofearth'sorbitAnglesubtended1Parsec=1AU1arcsecond1AU=1.5×1011m1arcsecond=13600×π180So,1Parsec=1.5×1011m13600×π180=3.1×106m
Hence, 1 parsec = 3×1016meters.