In physics, Parsec is a unit of distance and it is defined as when the radius of our planet earth makes an angle of a second of an arc, then the distance at which this angle subtended by earth is referred as a parsec. Mathematically 1Parsec=3.26Light years. Hence, (D) Distance parsec is a unit of measurement of Distance.
Question : 'Parsec' is the unit measurement of
Option 1: density of stars
Option 2: astronomical distance
Option 3: the brightness of heavenly bodies
Option 4: orbital velocity of giant stars
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