A previous version of this article, using a statistic cited in “Making It in America,” suggested that the Earth’s moon weighs about 80 million metric tons. While estimates of the moon’s weight vary, it is significantly greater than that. This version has been updated.
A note to our readers
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.