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The official unit for length is the meter. The kilometer (1000 meters) is often used in practice. Larger distances/lengths are often expressed in meters or kilometers; if the numbers are very large, scientific notation is used. On the other hand, in astronomy the following non-SI units are often used for very large distances:

  • The astronomical unit, which is the average distance from Sun to Earth. Approximately 150 million km.
  • The light-year, the distance light travels in a year. Approximately 9.5 x 1012 km.
  • The parsec - a hypothetical star at that distance would have a parallax of 1 arc-second (all stars except the Sun are at a distance of more than 1 parsec). 1 parsec is approximately 3.26 light-years. Prefixes such as kilo- and mega- are sometimes used with parsec.
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5mo ago

The largest unit of length is the kilometer (km), which is equivalent to 1,000 meters. It is commonly used to measure long distances, such as between cities or countries.

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Q: Which unit represents the largests unit of length?
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