In "A Short History of Nearly Everything," Bill Bryson discusses the composition of lunar material and its origins. It is believed that much of the material found on the Moon actually originated from the Earth's crust rather than its core. This intriguing connection helps explain the differences in iron content between the two celestial bodies, with the Moon being notably low in iron while Earth has a significant amount.

This observation sheds light on the geological history of the Earth-Moon system and suggests a complex interplay between the two during their formative years. Bryson's insights illustrate the uniqueness of the Moon as a satellite and how its material directly reflects Earth's surface rather than its deeper layers.