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Scientists use two main measurements in space, because it is so large that miles, kilometers, feet, etc. are just too small to measure efficiently. The two main measurements scientists use are:

AU (Astronomical Units): 1 AU = the mean distance from the sun to earth. (Generally used when measuring distances within the solar system)

LY (Light Years): 1 LY is the distance that light travels in 1 year. (Generally used when measuring distances outside the solar system)

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