EVERYDAY SCIENCE

Detailed explanation-1: -Answer: A parsec, or “parallax second, ” is defined as 3.26 light-years because of how it is measured. Earth circles the Sun, making one complete orbit per year. Over the course of several months, nearby stars appear to move with respect to more distant objects-an effect called parallax.

Detailed explanation-2: -It is a unit of distance used in astronomy, equal to about 3.26 light years (3.086 × 1013 kilometres). One parsec corresponds to the distance at which the mean radius of the earth’s orbit subtends an angle of one second of arc.

Detailed explanation-3: -A parsec is equal to 3.26 light years and because a light year the distance light travels 9.4 trillion km in one year, 1 parsec is equal to 30.8 trillion km.

Detailed explanation-4: -Unfortunately, like the similarly misused ‘light-year’, the parsec is a unit of length, not of time. A parsec is equal to about 3.26 light-years or roughly 31 trillion kilometres (19 trillion miles).