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- One astronomical unit equals the distance from the earth to the sun .
- The convenient length unit for measuring distances between planets is the astronomical unit
- Recall that one astronomical unit is the average distance between the sun and the earth
- Pluto , the remotest planet in the solar system currently known , is about 80 astronomical units away from the sun
- Astronomers believe that comets originate from the oort cloud which is located 5 , 000 to 100 , 000 astronomical units from the sun
An astronomical unit (abbreviated as AU, au, a.u.