By Measuring the Star Formation Rate in Galaxies as a Function

question 20

Multiple Choice

By measuring the star formation rate in galaxies as a function of their redshift, we have learned that the average star formation rate in galaxies peaked approximately _________ years ago.

• A) 1 billion
• B) 3 billion
• C) 5 billion
• D) 7 billion
• E) 12 billion

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