Wednesday, October 14, 2009

What is Parsec?

Parsec is another unit of distance. It was introduced when people started measuring the distance to nearby stars using the parallex method. It corresponds to the distance at which the mean radius of the Earth's orbit stretched an angle of one second of arc. One parsec is equal to about 3.258 light years. It is used to measure distances in astronomy since it is a convenient size to measure such large distances.

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