Nanoparsec

Nanoparsec (npc) is a of  one-billionth of a, equating to about 30.857 s, 0.1 , or about 4.84. This unit can be used to measure the sizes of planets and stars as an alternative of miles, kilometers, megameters, Earth radii,, or. For example, the mean circumference of is 1.30 nanoparsecs while 's mean radius is 2.27 nanoparsecs.