To estimate the expansion rate of the universe is a notoriously difficult problem because there is a lack of a single yardstick that all distances can be measured by.
A. To estimate the expansion rate of the universe is a notoriously difficult problem because there is a lack of a single yardstick that all distances can be measured by. --- 1. 'a lack of a single yardstick' is wordier than 'no single yardstick' in B. 2. Unidiomatic end of the sentence with a preposition.
B. Estimating the
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A. To estimate the expansion rate of the universe is a notoriously difficult problem because there is a lack of a single yardstick that all distances can be measured by. --- 1. 'a lack of a single yardstick' is wordier than 'no single yardstick' in B. 2. Unidiomatic end of the sentence with a preposition.
B. Estimating the
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