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Why do astronomers need special units, in addition to the metric system of units such as meters and ...

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Why do astronomers need special units, in addition to the metric system of units such as meters and ...

Why do astronomers need special units, in addition to the metric system of units such as meters and kilograms, to describe the universe?
A)   Distances and masses are very large, and representing them in metric units in cumbersome.
B)   Metric units cannot represent correctly the curvature of space observed by astronomers.
C)   Units used in the metric system are known to insufficient accuracy to satisfy the precision needed in modern astronomy.
D)   Metric units are too large to represent astronomical quantities with sufficient precision.

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein

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