Question

°° We use __ unit to express interplanetary distances. ( Class 6th ) °°

Answer 1

Answer:

For distances within our solar system, or other solar systems, the common unit is the 'Astronomical Unit' (A.U.)

A.U. = the average distance between the Earth and the Sun

Explanation:

For most everything else, stars, galaxies etc..., the distance unit is the parsec (pc). This is a convenient unit when measuring distances to stars by triangulation (what astronomers call parallax).

1 pc = 3.26 light years = about the distance to the nearest star

1 pc = 60 x 60 x 180/pi A.U. = 206265 A.U. --- by definition.

for distances within our galaxy or other galaxies it is kiloparsecs (kpc):

1 kpc = 1,000 pc