meter (m)  the fundamental unit of length in the metric system.
Equal to about 3.3 feet or 1.1 yard.
kilometer (km)  equal to 1000 meters.
Astronomical Unit (AU)  the commonly used unit of distance in the
Solar System; it is equal to the average EarthSun distance, or approximately 149,600,000 km.
light year (ly)  a commonly used unit of distance outside the solar
system, equal to the length travelled by light in one year. It is equal
to 9,460,000,000,000 km.
parsec (pc)  the preferred (by astronomers) unit of distance outside
the solar system. Defined as the distance at which 1 Astronomical Unit
subtends an angle of 1 second of arc (1/3600 of a degree), or the distance
an object has to be for its parallax to equal 1 second of arc. Equal to 3.26
light years or 30,800,000,000,000 km.
kiloparsec (kpc)  1000 parsecs.
Megaparsec (Mpc)  1 million parsecs.
The Cosmic Distance Scale was created by
Maggie Masetti.
Scientific Oversight was provided by Dr. Koji Mukai.
This file was last modified on Tuesday, 11Mar2008 16:02:48 EDT
