Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
8.1
Points
1.0
Fiction/Nonfiction
Nonfiction
Word Count
7964
Points per Word
0.000126
Page Count
64
Points per Page
0.015625
Description
This book traces the development of our knowledge of Mercury’s orbit, surface features, and atmosphere from the third century B.C. to the present.