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While on Earth we measure distances in km, for astronomy we use bigger yardsticks: in the solar system we use Astronomical Units (AU)Astronomical Unit (AU), which is equal to the average distance between the Earth and the sun, approximately 150 million km.

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“Long, Long Ago, in a Galaxy Far, Far Away”: Yardsticks of Space and Time

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  • 发表日期：

    2025年

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  • Amri Wandel,
  • Joseph Gale

摘要

While on Earth we measure distances in km, for astronomy we use bigger yardsticks: in the solar system we use Astronomical Units (AU)Astronomical Unit (AU), which is equal to the average distance between the Earth and the sun, approximately 150 million km.