Question

what is the defination of parsec , astronomical unit and light yr​

Answer 1

The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System. One parsecis approximately equal to 31 trillion kilometres (19 trillion miles), or 210,000 astronomical units, and equates to about 3.3 light-years.

Unit of: length/distance

Astronomical units: 2.06265×105 au; 3.26156 ly

Unit system: astronomical units

Metric (SI) units: 3.0857×1016 m; ~31 petametres

Answer 2

Answer:

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.

Explanation:

a unit of measurement equal to 149.6 million kilometres, the mean distance from the centre of the earth to the centre of the sun.

a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 million million miles).