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Parsec
01
秒差距
a unit of astronomical distance equivalent to about 3.26 light-years
par
sec
parsec
n
例子
Astronomers use parsec to measure distances to stars and galaxies.
Galaxies billions of parsecs away are visible with powerful telescopes.
Understanding parsec helps astronomers map the vastness of the universe.
The Milky Way galaxy has a diameter of tens of thousands of parsecs.
