answersLogoWhite

0

Any unit of length can be used; for example the official unit of length, which is the meter. However, to avoid having to write large numbers, the following three units are often used in astronomy: (1) The astronomical unit, the average distance between Earth and the Sun. Used mostly for measurements within the Solar System. (2) The light-year; the distance light travels in a year. Approximately 9.5 x 1015 meters. (3) The parsec. A star at this distance would appear to have a parallax of one arc-second. Equal to approximately 3.26 light-years.

User Avatar

Wiki User

11y ago

What else can I help you with?