Assume there are a million asteriods 1 kilometer across or larger in the asteroid belt. Assume all asteroids are perfectly spherical.  1) If a million asteroids 1-kilometer across were all combined into one spherical object, how big would it be across?  2) How many 1-kilometer diameter asteroids would it take to make an object as large as Earth?

The Solar System
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ISBN:9781305804562
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Chapter16: Meteorites, Asteroids, And Comets
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Assume there are a million asteriods 1 kilometer across or larger in the asteroid belt. Assume all asteroids are perfectly spherical. 

1) If a million asteroids 1-kilometer across were all combined into one spherical object, how big would it be across? 

2) How many 1-kilometer diameter asteroids would it take to make an object as large as Earth? 

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