A light-year (ly) is a unit of lenght, corresponding to the distance travelled by light in vacuum in one Julian year.

A light year is equal to:

  • 9,460,730,472,580.8 km (about 9.461 Pm)
  • about 5,879,000,000,000 statute miles
  • about 63,240 AU
  • about 0.3066 parsecs

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