An astronomical unit (au) is a unit used to express distances within the solar system. It is approximately the average distance between the Sun and the Earth, about 150 million km.
Class 6 Science NCERT Chapter 12
Chapter 12 Beyond Earth
What is an astronomical unit (au), and how is it used?
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An astronomical unit (au) is a standard measurement equal to the average distance between the Earth and the Sun, approximately 150 million kilometers (93 million miles). It is used to express distances within the Solar System, simplifying comparisons between planetary distances.
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